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<bibtex> %% This BibTeX bibliography file was created using BibDesk. %% http://bibdesk.sourceforge.net/

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@misc{Kor-S-2012, Author = {Ulrich Kortenkamp}, Date-Added = {2017-12-13 10:25:07 +0000}, Date-Modified = {2017-12-13 10:28:21 +0000}, Howpublished = {Available in the App Store}, Keywords = {sonstige}, Title = {Stellenwerttafel}, Type = {Application for iOS}, Url = {https://itunes.apple.com/de/app/stellenwerttafel/id568750442?mt=8}, Year = {2012}}

@inproceedings{GagKorRicStr-C-2016, Abstract = {The CindyJS Project brings interactive mathematical visualization to a broad variety of devices. Using projective geometry, homotopy methods and well tuned algorithms the CindyJS project is one of the first real time capable software projects in this field that at the same time approaches high-level mathematical descriptions and performance.}, Address = {Cham}, Author = {von Gagern, Martin and Kortenkamp, Ulrich and Richter-Gebert, J{\"u}rgen and Strobel, Michael}, Booktitle = Vorlage:Mathematical Software -- ICMS 2016: 5th International Conference, Date-Added = {2017-12-10 08:17:53 +0000}, Date-Modified = {2017-12-10 08:22:42 +0000}, Doi = {10.1007/978-3-319-42432-3_39}, Editor = {Greuel, Gert-Martin and Koch, Thorsten and Paule, Peter and Sommese, Andrew}, Isbn = {978-3-319-42432-3}, Keywords = {refereed}, Pages = {319--326}, Publisher = {Springer International Publishing}, Series = {Lecture Notes in Computer Science, vol 9725}, Title = {Cindy{JS}. Mathematical visualization on modern devices}, Url = {https://doi.org/10.1007/978-3-319-42432-3_39}, Venue = {Berlin}, Year = {2016}, Bdsk-Url-1 = {https://doi.org/10.1007/978-3-319-42432-3_39}}

@incollection{KorWol-RF-2017, Author = {Ulrich Kortenkamp and Bernd Wollring}, Booktitle = Vorlage:Basiswissen Lehrerbildung: Mathematik Unterrichten, Chapter = {6}, Date-Added = {2017-03-27 18:49:21 +0000}, Date-Modified = {2017-10-14 11:45:47 +0000}, Editor = {Maike Abshagen and B{\"a}rbel Barzel and J{\"u}rg Kramer and Thomas Riecke-Baulecke and Bettina R{\"o}sken-Winter and Christoph Selter}, Isbn = {9783772710841}, Keywords = {refereed}, Location = {Seelze}, Pages = {99--112}, Publisher = {Kallmeyer Klett}, Title = Vorlage:Raum und Form, Year = {2017}, Bdsk-File-1 = {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}}

@inbook{LadKor-DFUPV-2016, Address = {Cham}, Author = {Ladel, Silke and Kortenkamp, Ulrich}, Booktitle = {Mathematics Education in the Early Years: Results from the POEM2 Conference, 2014}, Date-Added = {2017-03-16 15:45:34 +0000}, Date-Modified = {2017-03-16 15:45:54 +0000}, Doi = {10.1007/978-3-319-23935-4_16}, Editor = {Meaney, Tamsin and Helenius, Ola and Johansson, Maria L. and Lange, Troels and Wernberg, Anna}, Isbn = {978-3-319-23935-4}, Keywords = {refereed}, Pages = {289--307}, Publisher = {Springer International Publishing}, Title = {Development of a Flexible Understanding of Place Value}, Url = {http://dx.doi.org/10.1007/978-3-319-23935-4_16}, Year = {2016}, Bdsk-Url-1 = {http://dx.doi.org/10.1007/978-3-319-23935-4_16}}

@inbook{LadKor-AATFADVM-2016a, Address = {Cham}, Author = {Ladel, Silke and Kortenkamp, Ulrich}, Booktitle = {International Perspectives on Teaching and Learning Mathematics with Virtual Manipulatives}, Date-Added = {2017-03-16 15:40:01 +0000}, Date-Modified = {2017-03-16 15:40:30 +0000}, Doi = {10.1007/978-3-319-32718-1_2}, Editor = {Moyer-Packenham, Patricia S.}, Isbn = {978-3-319-32718-1}, Keywords = {refereed}, Pages = {25--40}, Publisher = {Springer International Publishing}, Title = {Artifact-Centric Activity Theory---A Framework for the Analysis of the Design and Use of Virtual Manipulatives}, Url = {http://dx.doi.org/10.1007/978-3-319-32718-1_2}, Year = {2016}, Bdsk-Url-1 = {http://dx.doi.org/10.1007/978-3-319-32718-1_2}}

@proceedings{KorLam-MVZAHVNMWBU22AAMIGFDME-2012, Abstract = {The articles of this volume will be reviewed individually in MathEduc.}, Address = {Hildesheim}, Date-Added = {2017-03-16 15:37:23 +0000}, Date-Modified = {2017-03-16 15:42:13 +0000}, Editor = {Kortenkamp, Ulrich and Lambert, Anselm}, Identifier = {2015a.00068}, Isbn = {978-3-88120-823-9}, Keywords = {herausgeber}, Msc2010 = {A60xx (U50xx D10xx U70xx)}, Pages = {176~p.}, Publisher = {Franzbecker}, Title = {Medien vernetzen. Zur Zukunft des Analysisunterrichts vor dem Hintergrund der Verf\"ugbarkeit Neuer Medien (und Werkzeuge). Bericht \"uber die 26. und 27. Arbeitstagung des Arbeitskreises ``Mathematikunterricht und Informatik" in der Gesellschaft f\"ur Didaktik der Mathematik e.V.}, Year = {2012}}

@inproceedings{KorLad-FUPVTDT-2014, Abstract = {Summary: Place value is a key concept for numbers that is introduced in early mathematics. It is necessary to have a flexible understanding of place value for efficient arithmetic strategies and success in written algorithmic arithmetic. In our research we explore typical mistakes and misconceptions that occur with 3rd graders in German elementary school and investigate the various underlying actions when manipulating numbers in a place value chart. We also report on a follow-up quantitative study that compares real and virtual manipulatives for place value and their effect on learning of place value.}, Author = {Kortenkamp, Ulrich and Ladel, Silke}, Booktitle = {Proceedings of the 38th conference of the International Group for the Psychology of Mathematics Education ``Mathematics education at the edge", PME 38 held jointly with the 36th conference of PME-NA, Vancouver, Canada, July 15--20, 2014, Vol. 4}, Date-Added = {2017-03-16 15:36:13 +0000}, Date-Modified = {2017-03-16 15:43:24 +0000}, Identifier = {2015c.00588}, Isbn = {978-0-86491-360-9}, Keywords = {refereed}, Msc2010 = {F32xx (U62xx U72xx D72xx)}, Pages = {33-40}, Publisher = {International Group for the Psychology of Mathematics Education}, Title = {Flexible use and understanding of place value via traditional and digital tools.}, Year = {2014}}

@article{KanYamKitMaeNakKorTak-KCCKRC2CWG-2015, Abstract = {Summary: Dynamic Geometry Software (DGS) is a powerful tool which enables students to move geometric objects interactively. Through experimental simulations with DGS, mathematical facts and background mechanisms are accessible to students. However, especially when those facts and mechanisms are complicated, it is not so easy for some students to record and memorize them as established knowledge. For that purpose, reproducing some part of the output generated by DGS on printed teaching materials can be useful. Since the graphical output of DGS on a PC screen is not necessarily appropriate for printed materials, it is desirable that the interactive graphics capabilities of DGS and the qualified documentation capabilities of mathematical editing software be unified in a flexible manner. Recently we have developed a software package ``KETCindy to format the graphical output of Cinderella into graphical codes of TeX. Cinderella is one of the most popular DGS and TeX is one of the most popular tools for editing teaching materials or textbooks in collegiate mathematics education. Using KETCindy, we can build an environment in which collegiate students can clearly grasp mathematical concepts by interactively operating Cinderella on a PC screen, and can acquire established knowledge by repeatedly observing the graphical images reproduced on the high-quality mathematical documents edited by TeX.}, Author = {Kaneko, Masataka and Yamashita, Satoshi and Kitahara, Kiyoshi and Maeda, Yoshifumi and Nakamura, Yasuyuki and Kortenkamp, Ulrich and Takato, Setsuo}, Date-Added = {2017-03-16 15:35:53 +0000}, Date-Modified = {2017-03-16 15:44:45 +0000}, Identifier = {2016f.01418}, Issn = {1744-2710}, Journal = {The International Journal for Technology in Mathematics Education}, Keywords = {refereed}, Msc2010 = {U70xx (N80xx U50xx)}, Number = {4}, Pages = {179-185}, Publisher = {Research Information Ltd, Burnham, Bucks}, Title = {KETCindy -- collaboration of Cinderella and KETpic. Reports on CADGME 2014 conference working group.}, Volume = {22}, Year = {2015}}

@article{KorDoh-VBKRZ-2016, Abstract = {Zusammenfassung: Zugfiguren, d.h. dynamische Realisierungen von Konstruktionen im DGS, sind ein gutes Werkzeug, um die heuristischen Strategien des Vorw\"arts- und R\"uckw\"artsarbeiten zu unterst\"utzen. Was muss man \"uber ein Parallelogramm (oder ein anderes spezielles Viereck) wissen, um dieses zu (re-)konstruieren? Die Besch\"aftigung damit f\"uhrt zu elementaren Konstruktionsschritten wie auch zu den Typ-bestimmenden Eigenschaften spezieller Vierecke.}, Author = {Kortenkamp, Ulrich and Dohrmann, Christian}, Date-Added = {2017-03-16 15:33:30 +0000}, Date-Modified = {2017-03-16 15:34:05 +0000}, Identifier = {2016e.00716}, Issn = {0175-2235}, Journal = {Mathematik lehren}, Keywords = {lehrer}, Msc2010 = {G43xx (D83xx U73xx)}, Number = {196}, Pages = {18-21}, Publisher = {Friedrich Verlag, Seelze}, Title = {Vorw\"arts-R\"uckw\"arts zum Begriff. Konstruktion und Re-Konstruktion von Zugfiguren.}, Volume = {33}, Year = {2016}}

@article{KorMonTro-JB1EEEMIJM-2016, Abstract = {Summary: Jonathan M Borwein died on August 2nd. He was a major figure in the field of experimental mathematics. His death, at 65, was an astonishment for his family and his colleagues. We three, as mathematics educators who have worked with Jon, have been asked to pay homage to his life and his work. But we three have only shared a part of Jon's tremendous appetite for life and work, so we barely scratch the surface of the significance of his work. Ulli writes about Jon's experimental mathematics, Luc writes about the implications of Jon's work for mathematics education and John writes about Jon, culture and mathematics.}, Author = {Kortenkamp, Ulrich and Monaghan, John and Trouche, Luc}, Date-Added = {2017-03-16 15:30:54 +0000}, Date-Modified = {2017-06-14 14:41:34 +0000}, Doi = {10.1007/s10649-016-9729-0}, Identifier = {2016f.00016}, Issn = {0013-1954}, Journal = {Educational Studies in Mathematics}, Keywords = {invited}, Msc2010 = {A30xx}, Number = {2}, Pages = {131-136}, Publisher = {Springer Netherlands, Dordrecht}, Title = {Jonathan {M} Borwein (1951--2016): exploring, experiencing and experimenting in mathematics -- an inspiring journey in mathematics.}, Volume = {93}, Year = {2016}, Bdsk-Url-1 = {http://dx.doi.org/10.1007/s10649-016-9729-0}}

@inproceedings{BleDohKor-MEG-2016, Author = {Axel Blessing and Christian Dohrmann and Ulrich Kortenkamp}, Booksubtitle = {{Vortr{\"a}ge auf der 50. Tagung f{\"u}r Didaktik der Mathematik in Heidelberg}}, Booktitle = {{Beitr{\"a}ge zum Mathematikunterricht}}, Date-Added = {2016-08-12 12:01:04 +0000}, Date-Modified = {2017-10-14 11:51:59 +0000}, Keywords = {invited}, Language = {German}, Location = {M{\"u}nster}, Publisher = {WTM Verlag}, Title = Vorlage:Mathematikfortbildungen mit E-Learning gestalten, Year = {2016}, Bdsk-File-1 = {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}}

@article{KorFle-MWM-2013, Author = {Kortenkamp, Ulrich and Silke Fleckenstein}, Date-Added = {2016-08-12 11:38:15 +0000}, Date-Modified = {2017-06-14 14:46:16 +0000}, Journal = {Georg-Cantor-Hefte}, Keywords = {invited}, Pages = {25-39}, Title = {Madipedia -- Das Wiki f{\"u}r die Mathematikdidaktik}, Url = {http://madipedia.de/images/7/76/Artikel-cantor-madipedia.pdf}, Volume = {15}, Year = {2013}, Bdsk-File-1 = {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}}

@article{SinBarVilJonKorLeuOwe-RRGEISTR-2016, Abstract = {This survey on the theme of Geometry Education (including new technologies) focuses chiefly on the time span since 2008. Based on our review of the research literature published during this time span (in refereed journal articles, conference proceedings and edited books), we have jointly identified seven major threads of contributions that span from the early years of learning (pre-school and primary school) through to post-compulsory education and to the issue of mathematics teacher education for geometry. These threads are as follows: developments and trends in the use of theories; advances in the understanding of visuo spatial reasoning; the use and role of diagrams and gestures; advances in the understanding of the role of digital technologies; advances in the understanding of the teaching and learning of definitions; advances in the understanding of the teaching and learning of the proving process; and, moving beyond traditional Euclidean approaches. Within each theme, we identify relevant research and also offer commentary on future directions.}, Author = {Sinclair, Nathalie and Bartolini Bussi, Maria G. and de Villiers, Michael and Jones, Keith and Kortenkamp, Ulrich and Leung, Allen and Owens, Kay}, Date-Added = {2016-07-01 12:47:14 +0000}, Date-Modified = {2017-03-16 15:55:35 +0000}, Doi = {10.1007/s11858-016-0796-6}, Issn = {1863-9704}, Journal = {ZDM}, Keywords = {refereed}, Pages = {1--29}, Title = {Recent research on geometry education: an ICME-13 survey team report}, Url = {http://dx.doi.org/10.1007/s11858-016-0796-6}, Year = {2016}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://dx.doi.org/10.1007/s11858-016-0796-6}}

@collection{KorLam-A-2015a, Date-Added = {2015-09-18 16:36:56 +0000}, Date-Modified = {2017-03-27 17:05:59 +0000}, Editor = {Ulrich Kortenkamp and Anselm Lambert}, Keywords = {lehrer}, Location = {Seelze}, Number = {188}, Publisher = {Friedrich Verlag}, Series = Vorlage:Mathematik lehren, Title = {Algorithmen}, Year = {2015}}

@article{Kor-PK-2015, Author = {Ulrich Kortenkamp}, Date-Added = {2015-09-18 16:32:11 +0000}, Date-Modified = {2015-09-18 16:34:38 +0000}, Journaltitle = Vorlage:Mathematik lehren, Keywords = {lehrer}, Month = {2}, Pages = {38-41}, Title = Vorlage:Programmieren? Na klar!, Year = {2015}}

@article{KorLam-WD-2015, Author = {Ulrich Kortenkamp and Anselm Lambert}, Date-Added = {2015-09-18 16:30:04 +0000}, Date-Modified = {2015-09-18 16:37:47 +0000}, Journaltitle = Vorlage:Mathematik lehren, Keywords = {lehrer}, Month = {2}, Number = {188}, Pages = {2-9}, Title = {{Wenn {\ldots}, dann {\ldots} bis {\ldots}}}, Year = {2015}}

@inproceedings{KisBurVolKor-LTHTDCPS-2015, Author = {Kistner, Saskia and Burns, Bruce and Vollmeyer, Regina and Kortenkamp, Ulrich}, Booktitle = {Proceedings of the 16th Biennial EARLI Conference in Limassol (Cyprus)}, Date-Added = {2015-09-10 15:28:16 +0000}, Date-Modified = {2015-09-18 16:48:21 +0000}, Keywords = {refereed}, Title = {Learning through hypothesis testing during computer-based problem solving}, Url = {http://www.earli2015.org/media/EARLI2015/docs/EARLI2015_bookOfAbstracts.pdf}, Year = {2015}, Bdsk-Url-1 = {http://www.earli2015.org/media/EARLI2015/docs/EARLI2015_bookOfAbstracts.pdf}}

@inproceedings{Kor-CCMTSC-2015, Author = {Kortenkamp, Ulrich}, Booktitle = {Beitr{\"a}ge zum Mathematikunterricht. Vortr{\"a}ge auf der 49. Tagung f{\"u}r Didaktik der Mathematik in Basel}, Date-Added = {2015-04-11 12:42:55 +0000}, Date-Modified = {2015-04-11 12:44:01 +0000}, Editor = {Helmut Linneweber-Lammerskitten}, Keywords = {invited}, Location = {M{\"u}nster}, Publisher = {WTM Verlag}, Title = {C-Books: Creative Mathematical Thinking und Social Creativity}, Year = {2015}, Bdsk-File-1 = {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}}

@inproceedings{KisBurVolKor-WNGHLIMQ-2015, Author = {Saskia Kistner and Bruce D. Burns and Regina Vollmeyer and Ulrich Kortenkamp}, Booktitle = {Proceedings of the 37th Annual Meeting of the Cognitive Science Society}, Date-Added = {2015-04-11 12:32:27 +0000}, Date-Modified = {2017-03-16 16:00:12 +0000}, Editor = {D. C. Noelle and R. Dale and A. S. Warlaumont and J. Yoshimi and T. Matlock and C. D. Jennings and P. P. Maglio}, Keywords = {refereed}, Location = {Austin, TX}, Pages = {1117-1122}, Publisher = {Cognitive Science Society}, Title = {When Do Nonspecific Goals Help Learning? An Issue of Model Quality}, Year = {2015}, Bdsk-File-1 = {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}}

@article{KisBurVolKor-IUMSMGSE-2015, Author = {Saskia Kistner and Bruce Burns and Regina Vollmeyer and Ulrich Kortenkamp}, Date-Added = {2015-04-11 12:28:04 +0000}, Date-Modified = {2017-03-16 16:00:05 +0000}, Doi = {10.1080/17470218.2015.1076865}, Journaltitle = {Quarterly Journal of Experimental Psychology}, Keywords = {refereed}, Pages = {1-43}, Title = {The Importance of Understanding: Model Space Moderates Goal Specificity Effects}, Url = {http://dx.doi.org/10.1080/17470218.2015.1076865}, Year = {2015}, Bdsk-File-1 = {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}}

@inbook{Kor-PAEWQT-2015, Abstract = {In this paper we describe a mathematical approach to create an organic, yet efficient to create tiling for a large non-rectangular space, the Alexanderplatz in Berlin. We show how to use the refinement algorithm for Penrose tilings in order to create a polygonal tiling that consist of four different tiles and is quasi-periodic. We also derive, based on the refinement algorithm, bounds for the percentage of tiles of each type needed.

Another question that is addressed is whether it is possible to describe the calculated tiling in a linear form. Otherwise, it wouldn't be possible to use the tiling, as there must be a concise description suitable for the workers who lay out the concrete tiles.}, Author = {Kortenkamp, Ulrich}, Booksubtitle = {Volume II: The 1500s to the Future}, Booktitle = {Architecture and Mathematics from Antiquity to the Future}, Chapter = {79}, Date-Added = {2015-04-11 11:29:34 +0000}, Date-Modified = {2015-04-11 11:39:17 +0000}, Editor = {Kim Williams and Michael J. Ostwald}, Keywords = {refereed}, Location = {Basel}, Pages = {473-481}, Publisher = {Birkh{\"a}user}, Title = {Paving the {A}lexanderplatz Efficiently with a quasi-periodic tiling}, Url = {http://www.springer.com/de/book/9783319001425}, Volume = {2}, Volumes = {2}, Year = {2015}, Bdsk-File-1 = {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}}

@inproceedings{LadKor-DS-2015, Author = {Ladel, Silke and Kortenkamp, Ulrich}, Booktitle = {Beitr{\"a}ge zum Mathematikunterricht. Vortr{\"a}ge auf der 49. Tagung f{\"u}r Didaktik der Mathematik in Basel}, Date-Added = {2015-03-31 15:21:10 +0000}, Date-Modified = {2017-06-14 14:37:11 +0000}, Editor = {Helmut Linneweber-Lammerskitten}, Keywords = {invited}, Location = {M{\"u}nster}, Publisher = {WTM Verlag}, Title = {Dezimalbr{\"u}che und {S}tellenwerttafeln}, Year = {2015}, Bdsk-File-1 = {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}}

@article{KisVolBurKor-MDSDLWCPT-2016, Abstract = {Based on theories of scientific discovery learning and conceptual change, this study explores students' preconceptions in the domain of torques in physics and the development of these conceptions while learning with a scientific discovery learning task. Referring to a three-space theory of scientific discovery learning (Burns & Vollmeyer, 2000), the focus was on the content of model space, which is supposed to contain the current conceptualization/model of the learning domain, and on its change through hypothesis testing and experimenting. A multiple-choice test for assessing students' models of torques was developed and used in a study with secondary school students (N=47) who learned about torques using computer simulations. We identified those aspects of torques about which students had physically correct conceptions, and those about which misconceptions were predominant. Working with the computer simulations led to replacement of some misconceptions with physically correct conceptions, though some misconceptions were still common after learning. Analyzing individual differences in model development, we found that an intense use of the simulations was associated with the acquisition of correct conceptions. The three-space theory provided a useful framework for understanding conceptual change in scientific discovery learning.}, Author = {Saskia Kistner and Regina Vollmeyer and Bruce D. Burns and Ulrich Kortenkamp}, Date-Added = {2015-03-31 08:38:54 +0000}, Date-Modified = {2017-03-16 16:09:48 +0000}, Doi = {http://dx.doi.org/10.1016/j.chb.2016.02.041}, Journal = {Computers in Human Behaviour}, Keywords = {refereed, scientific discovery learning, multiple problem spaces, computer simulations, physics concepts, misconceptions, conceptual change}, Title = {Model Development in Scientific Discovery Learning with a Computer-Based Physics Task}, Year = {2016}, Bdsk-File-1 = {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}}

@misc{KisBurVolKor-MMNGAHL-2015, Author = {Saskia Kistner and Bruce D. Burns and Regina Vollmeyer and Ulrich Kortenkamp}, Date-Added = {2015-03-31 08:35:34 +0000}, Date-Modified = {2017-03-16 15:55:11 +0000}, Howpublished = {Poster presented at the International Convention of Psychological Science}, Keywords = {poster, refereed}, Title = {The Model Matters: Why Nonspecific Goals Do Not Always Help Learning}, Year = {2015}, Bdsk-File-1 = {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}}

@misc{KisVolBurKor-HVZWHWSBLS-2015, Author = {Kistner, Saskia and Vollmeyer, Regina and Burns, Bruce and Kortenkamp, Ulrich}, Date = {14.9.2015}, Date-Added = {2015-03-17 07:16:50 +0000}, Date-Modified = {2017-03-16 16:01:34 +0000}, Howpublished = {Vortrag auf der 15. Fachtagung P{\"a}dagogische Psychologie der Deutschen Gesellschaft f{\"u}r Psychologie (DGPs) in Kassel}, Keywords = {refereed}, Title = {Hypothesentesten vs. Zielann{\"a}herung: Wann hilft welche Strategie beim Lernen mit Simulationen?}, Year = {2015}}

@article{LamKor-GMIIA-2015, Author = {Anselm Lambert and Ulrich Kortenkamp}, Date-Added = {2015-01-21 10:10:03 +0000}, Date-Modified = {2015-01-21 10:18:48 +0000}, Journaltitle = Vorlage:Mathematik lehren, Keywords = {lehrer}, Month = {2}, Number = {188}, Pages = {10-11}, Title = Vorlage:Geniale Menschen und ihre Ideen zu Algorithmen, Year = {2015}, Bdsk-File-1 = {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}}

@inproceedings{LadKor-DCUPV-2015, Author = {Silke Ladel and Ulrich Kortenkamp}, Booktitle = {The Twenty-third ICMI Study: Primary Mathematics Study on Whole Numbers}, Date-Added = {2014-10-21 14:17:30 +0000}, Date-Modified = {2015-05-08 16:52:25 +0000}, Editor = {Xuhua Sun, Berinderjeet Kaur and Jarmila Novotn{\'a}}, Isbn = {978-99965-1-066-3}, Keywords = {refereed, pvc,}, Title = {Development of Conceptual Understanding of Place Value}, Year = {2015}}

@incollection{BaiKorLib-ODSAOEREZN-2014, Author = {Christoph Bail and Ulrich Kortenkamp and Paul Libbrecht}, Booktitle = {Sch{\"o}ne neue Welt? Open Educational Resources an Schulen}, Date-Added = {2014-08-30 06:15:59 +0000}, Date-Modified = {2015-01-14 15:25:09 +0000}, Editor = {Ute Erdsiek-Rave and Marei John-Ohnesorg}, Keywords = {invited}, Location = {Berlin}, Publisher = {Friedrich-Ebert-Stiftung}, Title = {Open Discovery Space -- Austausch von Open Educational Resources in einem zentralen Netzwerk}, Url = {http://library.fes.de/pdf-files/studienfoerderung/11147.pdf}, Year = {2014}, Bdsk-File-1 = {YnBsaXN0MDDUAQIDBAUGJCVYJHZlcnNpb25YJG9iamVjdHNZJGFyY2hpdmVyVCR0b3ASAAGGoKgHCBMUFRYaIVUkbnVsbNMJCgsMDxJXTlMua2V5c1pOUy5vYmplY3RzViRjbGFzc6INDoACgAOiEBGABIAFgAdccmVsYXRpdmVQYXRoWWFsaWFzRGF0YV8QJlBhcGVycy9MaWJicmVjaHRCYWlsLUFFWk5PRFMtMjAxNGEucGRm0hcLGBlXTlMuZGF0YU8RAgQAAAAAAgQAAgAADE1hY2ludG9zaCBIRAAAAAAAAAAAAAAAAAAAAAAAAABCRAAB/////x9MaWJicmVjaHRCYWlsLUFFWk5PRFMtMjAxNGEucGRmAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAD/////AAAAAAAAAAQAAAG1AAEAAwAACiBjdQAAAAAAAAAAAAAAAAAGUGFwZXJzAAIAdS86VXNlcnM6dWxsaTpDbG91ZHN0YXRpb246Q2xvdWRzdGF0aW9uIFVQOkVpZ2VuZSBQYXBlcnM6UHVibGlrYXRpb25lbiB2b24gVWxsaTpQYXBlcnM6TGliYnJlY2h0QmFpbC1BRVpOT0RTLTIwMTRhLnBkZgAADgBAAB8ATABpAGIAYgByAGUAYwBoAHQAQgBhAGkAbAAtAEEARQBaAE4ATwBEAFMALQAyADAAMQA0AGEALgBwAGQAZgAPABoADABNAGEAYwBpAG4AdABvAHMAaAAgAEgARAASAHNVc2Vycy91bGxpL0Nsb3Vkc3RhdGlvbi9DbG91ZHN0YXRpb24gVVAvRWlnZW5lIFBhcGVycy9QdWJsaWthdGlvbmVuIHZvbiBVbGxpL1BhcGVycy9MaWJicmVjaHRCYWlsLUFFWk5PRFMtMjAxNGEucGRmAAATAAEvAAAVAAIAC///AACABtIbHB0eWiRjbGFzc25hbWVYJGNsYXNzZXNdTlNNdXRhYmxlRGF0YaMdHyBWTlNEYXRhWE5TT2JqZWN00hscIiNcTlNEaWN0aW9uYXJ5oiIgXxAPTlNLZXllZEFyY2hpdmVy0SYnVHJvb3SAAQAIABEAGgAjAC0AMgA3AEAARgBNAFUAYABnAGoAbABuAHEAcwB1AHcAhACOALcAvADEAswCzgLTAt4C5wL1AvkDAAMJAw4DGwMeAzADMwM4AAAAAAAAAgEAAAAAAAAAKAAAAAAAAAAAAAAAAAAAAzo=}, Bdsk-File-2 = {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}}

@inproceedings{LadKor-TEFVSASAAT-2014, Author = {Silke Ladel and Ulrich Kortenkamp}, Booktitle = Vorlage:Von Audiopodcast bis Zahlensinn, Date-Added = {2014-08-22 08:32:26 +0000}, Date-Modified = {2017-12-10 08:09:08 +0000}, Editor = {Silke Ladel and Christoph Schreiber}, Keywords = {refereed,pvc}, Location = {M{\"u}nster}, Pages = {151-176}, Publisher = {WTM Verlag}, Series = {Lernen, Lehren und Forschen mit digitalen Medien}, Title = {{T{\"a}tigkeitsorientiert zu einem flexiblen Verst{\"a}ndnis von Stellenwerten -- Ein Ansatz aus Sicht der Artefact-Centric Activity Theory}}, Volume = {2}, Year = {2014}, Bdsk-File-1 = {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}}

@inproceedings{KorLam-RDEHEU-2014, Author = {Ulrich Kortenkamp and Anselm Lambert}, Booktitle = {Beitr{\"a}ge zum Mathematikunterricht. Vortr{\"a}ge auf der 48. Tagung f{\"u}r Didaktik der Mathematik in Koblenz}, Date-Added = {2014-03-24 07:31:52 +0000}, Date-Modified = {2014-08-20 16:03:39 +0000}, Editor = {J{\"u}rgen Roth and Judith Ames}, Keywords = {invited}, Location = {M{\"u}nster}, Organization = {Gesellschaft f{\"u}r Didaktik der Mathematik}, Publisher = {WTM Verlag}, Title = {So rechnet {D}eutschland -- {E}rgebnisse und {H}ypothesen einer {U}mfrage}, Venue = {Koblenz}, Year = {2014}, Bdsk-File-1 = {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}}

@inproceedings{LadKor-DNZODEEFVS-2014, Author = {Silke Ladel and Ulrich Kortenkamp}, Booktitle = {Beitr{\"a}ge zum Mathematikunterricht. Vortr{\"a}ge auf der 48. Tagung f{\"u}r Didaktik der Mathematik in Koblenz}, Date-Added = {2014-03-24 07:25:01 +0000}, Date-Modified = {2014-08-22 08:43:24 +0000}, Editor = {J{\"u}rgen Roth and Judith Ames}, Keywords = {invited,pvc}, Location = {M{\"u}nster}, Publisher = {WTM Verlag}, Title = {„Ist das dann noch ein Zehner oder ist das dann ein Einer? --- Zu einem flexiblen Verst{\"a}ndnis von Stellenwerten}, Year = {2014}, Bdsk-File-1 = {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}}

@misc{HofKorSei-HSMVSHVDDA-2013, Author = {Andrea Hoffkamp and Ulrich Kortenkamp and Susen Seidel}, Date-Added = {2013-09-23 16:26:36 +0000}, Date-Modified = {2013-09-23 16:30:57 +0000}, Howpublished = {Handreichung}, Keywords = {sonstige}, Location = {Wittenberg}, Organization = {Transferstelle „Qualit{\"a}t der Lehre`` am WZW Wissenschaftszentrum Sachsen-Anhalt}, Title = {{Handreichung zur Situation mathematischer Vorkurse an sachsen-anhaltischen Hochschulen und Vorschl{\"a}ge zu deren didaktisch-methodischer Ausgestaltung}}, Year = {2013}, Bdsk-File-1 = {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}}

@inbook{LadKor-EML-2014, Author = {Silke Ladel and Ulrich Kortenkamp}, Booktitle = {Early Mathematics Learning}, Chapter = {15}, Crossref = {KorBraBenKruLadVog-EML-2014}, Date-Added = {2013-09-16 22:25:31 +0000}, Date-Modified = {2015-09-18 15:24:30 +0000}, Keywords = {refereed}, Title = {Number concepts --- processes of internalization and externalization by the use of multi-touch technology}, Bdsk-File-1 = {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}}

@book{KorBraBenKruLadVog-EML-2014, Date-Added = {2013-09-16 22:20:28 +0000}, Date-Modified = {2014-04-24 09:36:58 +0000}, Editor = {Ulrich Kortenkamp and Birgit Brandt and Christiane Benz and G{\"o}tz Krummheuer and Silke Ladel and Rose Vogel}, Isbn = {978-1-4614-4677-4}, Keywords = {herausgeber}, Location = {New York}, Publisher = {Springer-Verlag}, Subtitle = {Selected Papers of the POEM 2012 Conference}, Title = {Early Mathematics Learning}, Url = {http://www.springer.com/education+%26+language/mathematics+education/book/978-1-4614-4677-4}, Year = {2014}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://www.springer.com/education+%26+language/mathematics+education/book/978-1-4614-4677-4}}

@inproceedings{LadKor-DTBLEPVUAAT-2013, Author = {Silke Ladel and Ulrich Kortenkamp}, Booktitle = {Proceedings of the 37th conference of the International Group for the Psychology of Mathematics Education. Mathematics learning across the life span}, Date-Added = {2013-09-16 21:54:50 +0000}, Date-Modified = {2014-08-22 08:20:54 +0000}, Editor = {Anke M. Lindmeier and Aiso Heinze}, Keywords = {refereed, pvc}, Pages = {188-192}, Title = {Designing a technology based learning environment for place value using artifact-centric activity theory}, Volume = {1}, Year = {2013}, Bdsk-File-1 = {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}, Bdsk-File-2 = {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}}

@book{Kor-LZ-2009, Author = {Ulrich Kortenkamp}, Date-Added = {2013-09-16 20:28:09 +0000}, Date-Modified = {2013-09-16 20:32:50 +0000}, Keywords = {material}, Location = {M{\"u}nchen}, Note = {230 Noppenbausteine mit Praxisbuch.}, Publisher = {Terzio Verlag}, Rating = {2}, Title = {Lernbausteine Zahlenmauern}, Url = {http://www.book2look.com/vBook.aspx?id=6N4Ovvpbs9}, Year = {2009}, Bdsk-Url-1 = {http://www.book2look.com/vBook.aspx?id=6N4Ovvpbs9}}

@book{Kor-LK-2009, Author = {Ulrich Kortenkamp}, Date-Added = {2013-09-16 20:24:41 +0000}, Date-Modified = {2013-09-16 20:32:33 +0000}, Keywords = {material}, Location = {M{\"u}nchen}, Note = {206 Noppenbausteine mit Praxisbuch.}, Publisher = {Terzio Verlag}, Rating = {2}, Title = {Lernbausteine Klammergebirge}, Url = {http://www.book2look.com/vBook.aspx?id=bjEUHu6dis}, Year = {2009}, Bdsk-Url-1 = {http://www.book2look.com/vBook.aspx?id=bjEUHu6dis}}

@article{KisBurVolKor-ESSMSPS-2013a, Author = {Saskia Kistner and Bruce Burns and Regina Vollmeyer and Ulrich Kortenkamp}, Date-Added = {2013-09-16 19:53:47 +0000}, Date-Modified = {2015-09-18 16:36:10 +0000}, Doi = {10.1080/20445911.2014.960872}, Issue = {7}, Journaltitle = {Journal of Cognitive Psychology}, Keywords = {refereed}, Pages = {818-829}, Title = {An Explorative Study of Search of Model Space in Problem Solving}, Url = {http://dx.doi.org/10.1080/20445911.2014.960872}, Volume = {26}, Year = {2014}, Bdsk-File-1 = {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}}

@inproceedings{LibKorMer-IWIG-2009, Author = {Paul Libbrecht and Ulrich Kortenkamp and Christian Mercat}, Booktitle = {Proceedings of the 2nd Workshop Towards a Digital Mathematics Library (DML-2009)}, Date-Added = {2013-05-18 12:33:44 +0000}, Date-Modified = {2016-08-11 14:08:06 +0000}, Editor = {Petr Sojka}, Isbn = {978-80-210-4781-5}, Keywords = {refereed, intergeo}, Publisher = {Masaryk University}, Title = {I2Geo: a Web-Library of Interactive Geometry}, Year = {2009}, Bdsk-File-1 = {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}}

@inproceedings{LibKor-RMDEA-2013, Author = {Paul Libbrecht and Ulrich Kortenkamp}, Booktitle = {Proceedings of CERME 8, Antalya}, Date-Added = {2013-05-18 12:30:51 +0000}, Date-Modified = {2013-05-18 12:40:15 +0000}, Keywords = {refereed}, Title = {The Role of Metadata in the Design of Educational Activities}, Year = {2013}, Bdsk-File-1 = {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}}

@inproceedings{LibKorRebMul-TCTA-2013, Author = {Paul Libbrecht and Ulrich Kortenkamp and Sandra Rebholz and Wolfgang M{\"u}ller}, Booktitle = {Proceedings of the 2nd International Workshop on Teaching Analytics (IWTA-2013)}, Date-Added = {2013-03-01 14:53:58 +0000}, Date-Modified = {2013-09-16 20:03:17 +0000}, Editor = {Ravi Vatrapu}, Keywords = {refereed}, Title = {Tales of a Companion Teacher Analytics}, Url = {http://ceur-ws.org/Vol-985/paper4.pdf}, Year = {2013}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://ceur-ws.org/Vol-985/paper4.pdf}}

@misc{KisBurVolKor-ESSMSPS-2013, Abstract = {Building on dual-space theories, the three-space theory of problem solving suggests to add search of a model space in addition to search of experiment and hypothesis space. This study aimed at exploring the three postulated spaces, especially model space, by means of verbal protocols. Participants (n=32) were asked to think aloud while working with a computer based learning program. With this program they could learn about torques in physics using interactive graphics in which experiments with levers and forces could be conducted. Their knowledge about torques was tested before and after working with the program. Verbal protocols were analyzed with regard to the amount of search of the three spaces and regarding the quality of the participants' models for torques. The three postulated spaces could be reliably identified in the protocols. For validity, the model quality score was related to performance and predicted final knowledge beyond prior knowledge. Our results add to the validity of model space and allow us to derive more specific hypotheses from the three-space theory.}, Author = {Saskia Kistner and Bruce Burns and Regina Vollmeyer and Ulrich Kortenkamp}, Date-Added = {2013-02-11 08:27:42 +0000}, Date-Modified = {2014-08-22 20:27:13 +0000}, Howpublished = {Poster presented at the 35th Annual Conference of the Cognitive Science Society in Berlin (Germany), July 31th-August 3rd}, Keywords = {poster}, Title = {An Explorative Study of Search of Model Space in Problem Solving}, Url = {http://www.academia.edu/4237499}, Year = {2013}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://www.academia.edu/4237499}}

@misc{KisBurKorVol-LWIPP-2012, Author = {Kistner, Saskia and Burns, Bruce and Kortenkamp, Ulrich and Vollmeyer, Regina}, Date-Added = {2012-07-18 05:44:44 +0000}, Date-Modified = {2012-07-18 05:47:22 +0000}, Howpublished = {Paper presented at the International Conference on Thinking (ICT) in London (UK), July 4th-July 6th}, Keywords = {sonstige}, Title = {Learning with an interactive physics programme}, Year = {2012}, Bdsk-File-1 = {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}}

@inproceedings{LadKor-EMWMAA-2012, Author = {Ladel, Silke and Kortenkamp, Ulrich}, Booktitle = {Proceedings of POEM 2012}, Date-Added = {2012-05-11 09:39:33 +0000}, Date-Modified = {2012-05-11 09:40:35 +0000}, Keywords = {invited}, Title = {Early maths with multi-touch -- an activity-theoretic approach}, Url = {http://cermat.org/poem2012/main/proceedings_files/Ladel-Kortenkamp-POEM2012.pdf}, Year = {2012}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://cermat.org/poem2012/main/proceedings_files/Ladel-Kortenkamp-POEM2012.pdf}}

@inproceedings{LadKor-AAMTEML-2011, Author = {Ladel, Silke and Kortenkamp, Ulrich}, Booktitle = {Proceedings of ATATEMLO 2011 in Paris}, Date-Added = {2012-05-11 09:37:30 +0000}, Date-Modified = {2012-05-11 10:16:26 +0000}, Keywords = {refereed}, Title = {An activity-theoretic approach to multi-touch tools in early maths learning}, Year = {2011}, Bdsk-File-1 = {YnBsaXN0MDDUAQIDBAUGJCVYJHZlcnNpb25YJG9iamVjdHNZJGFyY2hpdmVyVCR0b3ASAAGGoKgHCBMUFRYaIVUkbnVsbNMJCgsMDxJXTlMua2V5c1pOUy5vYmplY3RzViRjbGFzc6INDoACgAOiEBGABIAFgAdccmVsYXRpdmVQYXRoWWFsaWFzRGF0YV8QKFBhcGVycy9MYWRlbEtvcnRlbmthbXAtQUFNVEVNTC0yMDExYS5wZGbSFwsYGVdOUy5kYXRhTxECDAAAAAACDAACAAAMTWFjaW50b3NoIEhEAAAAAAAAAAAAAAAAAAAAAAAAAEJEAAH/////H0xhZGVsS29ydGVua2FtcC1BQSNGRkZGRkZGRi5wZGYAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAP////8AAAAAAAAAAAAAAAAAAQADAAAKIGN1AAAAAAAAAAAAAAAAAAZQYXBlcnMAAgB3LzpVc2Vyczp1bGxpOkNsb3Vkc3RhdGlvbjpDbG91ZHN0YXRpb24gVVA6RWlnZW5lIFBhcGVyczpQdWJsaWthdGlvbmVuIHZvbiBVbGxpOlBhcGVyczpMYWRlbEtvcnRlbmthbXAtQUFNVEVNTC0yMDExYS5wZGYAAA4ARAAhAEwAYQBkAGUAbABLAG8AcgB0AGUAbgBrAGEAbQBwAC0AQQBBAE0AVABFAE0ATAAtADIAMAAxADEAYQAuAHAAZABmAA8AGgAMAE0AYQBjAGkAbgB0AG8AcwBoACAASABEABIAdVVzZXJzL3VsbGkvQ2xvdWRzdGF0aW9uL0Nsb3Vkc3RhdGlvbiBVUC9FaWdlbmUgUGFwZXJzL1B1Ymxpa2F0aW9uZW4gdm9uIFVsbGkvUGFwZXJzL0xhZGVsS29ydGVua2FtcC1BQU1URU1MLTIwMTFhLnBkZgAAEwABLwAAFQACAAv//wAAgAbSGxwdHlokY2xhc3NuYW1lWCRjbGFzc2VzXU5TTXV0YWJsZURhdGGjHR8gVk5TRGF0YVhOU09iamVjdNIbHCIjXE5TRGljdGlvbmFyeaIiIF8QD05TS2V5ZWRBcmNoaXZlctEmJ1Ryb290gAEACAARABoAIwAtADIANwBAAEYATQBVAGAAZwBqAGwAbgBxAHMAdQB3AIQAjgC5AL4AxgLWAtgC3QLoAvEC/wMDAwoDEwMYAyUDKAM6Az0DQgAAAAAAAAIBAAAAAAAAACgAAAAAAAAAAAAAAAAAAANE}}

@article{LadKor-AAMTEML-2012, Abstract = {In this article we present an activity theory based framework that can capture the complex situations that arise when modern technology like multi-touch devices are introduced in classroom situations. As these devices are able to cover more activities than traditional technologies, even computer-based, media, we have to accept that they now take a larger role in the model of interactions. We reflect this fact by moving the artefact into the centre of our observations, leading to an artefact-centric activity theory (ACAT). The theory was developed in the need of analysing learning environments for primary maths education.}, Author = {Ladel, Silke and Kortenkamp, Ulrich}, Date-Added = {2012-05-11 07:04:53 +0000}, Date-Modified = {2013-07-15 14:40:24 +0000}, Journal = {The International Journal for Technology in Mathematics Education}, Keywords = {refereed}, Number = {1}, Title = {An activity-theoretic approach to multi-touch tools in early maths learning}, Url = {http://www.tech.plym.ac.uk/research/mathematics_education/field%20of%20work/ijtme/volume_20/number_one.html#one}, Volume = {20}, Year = {2013}, Bdsk-File-1 = {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}, Bdsk-File-2 = {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}, Bdsk-Url-1 = {http://www.tech.plym.ac.uk/research/mathematics_education/field%20of%20work/ijtme/volume_20/number_one.html#one}}

@techreport{Kor-IWICKZ-2012, Author = {Kortenkamp, Ulrich}, Date-Added = {2012-01-30 21:48:00 +0000}, Date-Modified = {2015-04-15 07:27:19 +0000}, Institution = {TU Dresden}, Keywords = {invited}, Title = {Interaktives Whiteboard, i{P}ad \& Co. -- das {K}lassenzimmer der {Z}ukunft}, Url = {http://cermat.org/sites/default/files/Kortenkamp-IWICKZ-2012a.pdf}, Year = {2012}, Bdsk-File-1 = {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}}

@incollection{Kor-EAVA-2011, Address = {Hildesheim}, Author = {Kortenkamp, Ulrich}, Booktitle = {Mathematik f{\"u}r alle - Wege zum {\"O}ffnen von Mathematik. Mathematikdidaktische Ans{\"a}tze. Festschrift f{\"u}r Wilfried Herget}, Date-Added = {2011-10-28 21:30:22 +0000}, Date-Modified = {2011-10-28 21:34:07 +0000}, Editor = {Krohn, Thomas and Malitte, Eva and Richter, Gerd and Richter, Karin and Sch{\"o}neburg, Silvia and Sommer, Rolf}, Keywords = {invited}, Pages = {173-180}, Publisher = {Franzbecker}, Title = {Die etwas andere Vorlesung: AnOrMaL}, Year = {2011}, Bdsk-File-1 = {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}}

@proceedings{KorLamZei-CPATM-2011, Date-Added = {2011-10-21 08:48:35 +0000}, Date-Modified = {2017-10-14 11:42:02 +0000}, Editor = {Kortenkamp, Ulrich and Lambert, Anselm and Zeimetz, Antonia}, Isbn = {978-3-88120-822-2}, Keywords = {herausgeber}, Language = {German}, Location = {Hildesheim}, Publisher = {Franzbecker}, Subtitle = {{Bericht {\"u}ber die 24. und 25. Arbeitstagung des Arbeitskreises Mathematikunterricht und Informatik}}, Title = {{Computerwerkzeuge und Pr{\"u}fungen / Aufgaben mit Technologieeinsatz im Mathematikunterricht}}, Year = {2011}}

@book{RicKor-CMWWIGS-2012, Author = {Richter-Gebert, J{\"u}rgen and Kortenkamp, Ulrich H.}, Date-Added = {2011-10-21 08:46:15 +0000}, Date-Modified = {2017-12-10 09:05:03 +0000}, Keywords = {software}, Publisher = {Springer-Verlag}, Title = {The Cinderella.2 Manual -- Working with the Interactive Geometry Software}, Year = {2012}}

@article{KorDoh-duo-2011, Author = {Kortenkamp, Ulrich and Dohrmann, Christian}, Date-Added = {2011-10-21 06:49:05 +0000}, Date-Modified = {2017-10-14 11:33:11 +0000}, Journal = {《数学教学》}, Keywords = {lehrer}, Number = {4}, Title = {``多触摸使用者界面的几何教育意义分析}, Year = {2011}, Bdsk-File-1 = {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}}

@article{KorLab-IIGEI-2011, Affiliation = {CERMAT, University of Education Karlsruhe, Postfach 11 10 62, 76060 Karlsruhe, Germany}, Author = {Kortenkamp, Ulrich and Laborde, Colette}, Date-Added = {2011-06-03 07:48:38 +0000}, Date-Modified = {2016-08-11 14:10:18 +0000}, Issn = {1863-9690}, Journal = {ZDM -- The International Journal on Mathematics Education}, Keyword = {Mathematics}, Keywords = {herausgeber, intergeo}, Note = {10.1007/s11858-011-0340-7}, Pages = {1-3}, Publisher = {Springer Berlin / Heidelberg}, Title = {Interoperable {I}nteractive {G}eometry for {E}urope: an introduction}, Url = {http://dx.doi.org/10.1007/s11858-011-0340-7}, Year = {2011}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://dx.doi.org/10.1007/s11858-011-0340-7}}

@incollection{BesHerKorMulZim-ETWIAF-2012, Author = {Bescherer, Christine and Herding, Daniel and Kortenkamp, Ulrich and M{\"u}ller, Wolfgang and Zimmermann, Marc}, Booktitle = {Intelligent and Adaptive Learning Systems: Technology Enhanced Support for Learners and Teachers}, Date-Added = {2011-04-04 21:18:33 +0000}, Date-Modified = {2014-09-15 10:15:23 +0000}, Editor = {Graf, Sabine and Lin, Fuhua and Kinshuk and McGreal, Rory}, Keywords = {refereed; process assessment}, Publisher = {IGI Global}, Title = {E-learning Tools with Intelligent Assessment and Feedback}, Year = {2012}, Bdsk-File-1 = {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}}

@incollection{KorBle-VEP-2011, Address = {Hershey, PA}, Author = {Kortenkamp, Ulrich and Blessing, Axel M.}, Booktitle = {Investigations on E-Learning Patterns: Context Factors, Problems, and Solutions}, Chapter = {15}, Date-Added = {2011-02-25 17:28:07 +0100}, Date-Modified = {2011-04-04 10:01:35 +0000}, Doi = {10.4018/978-1-60960-144-7.ch015}, Editor = {Kohls, Christian and Wedekind, Joachim}, Keywords = {refereed}, Pages = {237-248}, Publisher = {Information Science Reference}, Title = {VideoClipQuests as an E-Learning Pattern}, Year = {2011}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://dx.doi.org/10.4018/978-1-60960-144-7.ch015}}

@article{KorModOldPolRab-OMAW-2009, Abstract = {Objektorientierte Modellierung (OOM) ist ein wich- tiges Konzept der Fachinformatik und wird vonseiten der Didaktik der Informatik derzeit f{\"u}r den Unterricht in beiden Sekundarstufen stark empfohlen. So wird in den Bildungsstandards f{\"u}r die Sekundarstufe I gefordert, dass alle(!) Sch{\"u}ler und Sch{\"u}lerinnen der Jahr- gangsstufen 8 bis 10 ,,f{\"u}r einfache Sachverhalte objekt-orientierte Modelle [entwickeln] und diese mit Klas- sendiagrammen dar[stellen]`` (AKBSI, 2008, S. 47).

Die Gr{\"u}nde f{\"u}r die Behandlung der OOM in der Schule sind einleuchtend; es stellt sich aber die Frage, wie fr{\"u}h und wie intensiv sie eine Rolle spielen sollte. Etliche der hier zusammengetragenen Argumente sind nicht neu (siehe z.B. Hartmann, 2005), sollen aber noch einmal bewusst gemacht werden, um eine Abw{\"a}gung zu erm{\"o}glichen.}, Author = {Kortenkamp, Ulrich and Modrow, Eckart and Oldenburg, Reinhard and Poloczek, J{\"u}rgen and Rabel, Magnus}, Date-Added = {2010-12-16 12:16:30 +0100}, Date-Modified = {2013-05-18 12:49:29 +0000}, Journal = {LOG-IN}, Keywords = {lehrer}, Number = {160/161}, Pages = {22-28}, Title = {Objektorientierte Modellierung -- aber wann und wie?}, Year = {2009}, Bdsk-File-1 = {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}}

@misc{TrgKorJahLibMerRecSou-IPSDGROE-2010, Author = {Trgalova, Jana and Kortenkamp, Ulrich and Jahn, Ana Paula and Libbrecht, Paul and Mercat, Christian and Recio, Tomas and Soury-Lavergne, Sophie}, Date-Added = {2010-12-15 00:39:11 +0100}, Date-Modified = {2016-08-11 14:08:19 +0000}, Howpublished = {poster presentation at CERME 7}, Keywords = {poster, intergeo}, Title = {I2Geo.net -- a platform for sharing dynamic geometry resources all over Europe}, Year = {2011}, Bdsk-File-1 = {YnBsaXN0MDDUAQIDBAUGJCVYJHZlcnNpb25YJG9iamVjdHNZJGFyY2hpdmVyVCR0b3ASAAGGoKgHCBMUFRYaIVUkbnVsbNMJCgsMDxJXTlMua2V5c1pOUy5vYmplY3RzViRjbGFzc6INDoACgAOiEBGABIAFgAdccmVsYXRpdmVQYXRoWWFsaWFzRGF0YV8QWlBhcGVycy9UcmdhbG92YUtvcnRlbmthbXBKYWhuTGllYmJyZWNodE1lcmNhdFJlY2lvU291cnktTGF2ZXJnbmUtSTJHZW8ubmV0LTIwMTAtUG9zdGVyLnBkZtIXCxgZV05TLmRhdGFPEQLUAAAAAALUAAIAAAxNYWNpbnRvc2ggSEQAAAAAAAAAAAAAAAAAAAAAAAAAQkQAAf////8fVHJnYWxvdmFLb3J0ZW5rYW1wI0ZGRkZGRkZGLnBkZgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA/////wAAAAAAAAAEAAABtQABAAMAAAogY3UAAAAAAAAAAAAAAAAABlBhcGVycwACAKkvOlVzZXJzOnVsbGk6Q2xvdWRzdGF0aW9uOkNsb3Vkc3RhdGlvbiBVUDpFaWdlbmUgUGFwZXJzOlB1Ymxpa2F0aW9uZW4gdm9uIFVsbGk6UGFwZXJzOlRyZ2Fsb3ZhS29ydGVua2FtcEphaG5MaWViYnJlY2h0TWVyY2F0UmVjaW9Tb3VyeS1MYXZlcmduZS1JMkdlby5uZXQtMjAxMC1Qb3N0ZXIucGRmAAAOAKgAUwBUAHIAZwBhAGwAbwB2AGEASwBvAHIAdABlAG4AawBhAG0AcABKAGEAaABuAEwAaQBlAGIAYgByAGUAYwBoAHQATQBlAHIAYwBhAHQAUgBlAGMAaQBvAFMAbwB1AHIAeQAtAEwAYQB2AGUAcgBnAG4AZQAtAEkAMgBHAGUAbwAuAG4AZQB0AC0AMgAwADEAMAAtAFAAbwBzAHQAZQByAC4AcABkAGYADwAaAAwATQBhAGMAaQBuAHQAbwBzAGgAIABIAEQAEgCnVXNlcnMvdWxsaS9DbG91ZHN0YXRpb24vQ2xvdWRzdGF0aW9uIFVQL0VpZ2VuZSBQYXBlcnMvUHVibGlrYXRpb25lbiB2b24gVWxsaS9QYXBlcnMvVHJnYWxvdmFLb3J0ZW5rYW1wSmFobkxpZWJicmVjaHRNZXJjYXRSZWNpb1NvdXJ5LUxhdmVyZ25lLUkyR2VvLm5ldC0yMDEwLVBvc3Rlci5wZGYAABMAAS8AABUAAgAL//8AAIAG0hscHR5aJGNsYXNzbmFtZVgkY2xhc3Nlc11OU011dGFibGVEYXRhox0fIFZOU0RhdGFYTlNPYmplY3TSGxwiI1xOU0RpY3Rpb25hcnmiIiBfEA9OU0tleWVkQXJjaGl2ZXLRJidUcm9vdIABAAgAEQAaACMALQAyADcAQABGAE0AVQBgAGcAagBsAG4AcQBzAHUAdwCEAI4A6wDwAPgD0APSA9cD4gPrA/kD/QQEBA0EEgQfBCIENAQ3BDwAAAAAAAACAQAAAAAAAAAoAAAAAAAAAAAAAAAAAAAEPg==}}

@inproceedings{KorKre-K-2010, Address = {M{\"u}nster}, Author = {Kortenkamp, Ulrich and Kreis, Yves}, Booktitle = {Beitr{\"a}ge zum Mathematikunterricht. Vortr{\"a}ge auf der 44. Tagung f{\"u}r Didaktik der Mathematik in M{\"u}nchen}, Date-Added = {2010-12-10 19:08:06 +0100}, Date-Modified = {2011-01-28 10:02:14 +0100}, Keywords = {invited}, Pages = {501-504}, Publisher = {WTM Verlag}, Title = {Konstruktionsbeschreibungen und DGS}, Url = {http://www.mathematik.tu-dortmund.de/ieem/cms/media/BzMU/BzMU2010/BzMU10_KORTENKAMP_Ulrich_Intergeo.pdf}, Year = {2010}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://www.mathematik.tu-dortmund.de/ieem/cms/media/BzMU/BzMU2010/BzMU10_KORTENKAMP_Ulrich_Intergeo.pdf}}

@inproceedings{KorDohKreDor-UIPTR-2009, Abstract = {We describe the key achievements of Intergeo, a project co-funded within the eContentplus programme of the European Union, and their impact on teacher education, based on the technical and educational concepts of the Intergeo Platform.}, Address = {Metz}, Author = {Kortenkamp, Ulrich and Dohrmann, Christian and Kreis, Yves and Dording, Carole}, Booktitle = {Proceedings of the 9th International Conference on Technology in Mathematics Teaching}, Date-Added = {2010-12-10 10:33:19 +0100}, Date-Modified = {2016-08-11 14:08:59 +0000}, Editor = {Bardini, C. and Fortin, C. and Oldknow, Adrian and Vagost, D.}, Keywords = {refereed, intergeo}, Publisher = {ICTMT-9}, Title = {Using the {I}ntergeo Platform for Teaching and Research}, Year = {2009}, Bdsk-File-1 = {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}}

@inproceedings{LadKor-IMSFSS-2011, Author = {Ladel, Silke and Kortenkamp, Ulrich}, Booktitle = {Proceedings of CERME 7, Rzeszow}, Date-Added = {2010-12-08 18:38:36 +0100}, Date-Modified = {2012-01-30 21:52:05 +0000}, Keywords = {refereed}, Title = {Implementation of a multi-touch-environment supporting finger symbol sets}, Year = {2011}, Bdsk-File-1 = {YnBsaXN0MDDUAQIDBAUGJCVYJHZlcnNpb25YJG9iamVjdHNZJGFyY2hpdmVyVCR0b3ASAAGGoKgHCBMUFRYaIVUkbnVsbNMJCgsMDxJXTlMua2V5c1pOUy5vYmplY3RzViRjbGFzc6INDoACgAOiEBGABIAFgAdccmVsYXRpdmVQYXRoWWFsaWFzRGF0YV8QJ1BhcGVycy9MYWRlbEtvcnRlbmthbXAtSU1TRlNTLTIwMTFiLnBkZtIXCxgZV05TLmRhdGFPEQIGAAAAAAIGAAIAAAxNYWNpbnRvc2ggSEQAAAAAAAAAAAAAAAAAAAAAAAAAQkQAAf////8fTGFkZWxLb3J0ZW5rYW1wLUlNI0ZGRkZGRkZGLnBkZgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA/////wAAAAAAAAAAAAAAAAABAAMAAAogY3UAAAAAAAAAAAAAAAAABlBhcGVycwACAHYvOlVzZXJzOnVsbGk6Q2xvdWRzdGF0aW9uOkNsb3Vkc3RhdGlvbiBVUDpFaWdlbmUgUGFwZXJzOlB1Ymxpa2F0aW9uZW4gdm9uIFVsbGk6UGFwZXJzOkxhZGVsS29ydGVua2FtcC1JTVNGU1MtMjAxMWIucGRmAA4AQgAgAEwAYQBkAGUAbABLAG8AcgB0AGUAbgBrAGEAbQBwAC0ASQBNAFMARgBTAFMALQAyADAAMQAxAGIALgBwAGQAZgAPABoADABNAGEAYwBpAG4AdABvAHMAaAAgAEgARAASAHRVc2Vycy91bGxpL0Nsb3Vkc3RhdGlvbi9DbG91ZHN0YXRpb24gVVAvRWlnZW5lIFBhcGVycy9QdWJsaWthdGlvbmVuIHZvbiBVbGxpL1BhcGVycy9MYWRlbEtvcnRlbmthbXAtSU1TRlNTLTIwMTFiLnBkZgATAAEvAAAVAAIAC///AACABtIbHB0eWiRjbGFzc25hbWVYJGNsYXNzZXNdTlNNdXRhYmxlRGF0YaMdHyBWTlNEYXRhWE5TT2JqZWN00hscIiNcTlNEaWN0aW9uYXJ5oiIgXxAPTlNLZXllZEFyY2hpdmVy0SYnVHJvb3SAAQAIABEAGgAjAC0AMgA3AEAARgBNAFUAYABnAGoAbABuAHEAcwB1AHcAhACOALgAvQDFAs8C0QLWAuEC6gL4AvwDAwMMAxEDHgMhAzMDNgM7AAAAAAAAAgEAAAAAAAAAKAAAAAAAAAAAAAAAAAAAAz0=}}

@inproceedings{LadKor-FMBUNO-2011, Abstract = {Basic concepts of numbers and operations are fundamental for mathematical learning. Suitable materials for developing such basic concepts are hands and fingers. Among other things, this is because of their natural structure of 5 and 10. To support the development of concepts and the process of internalization a linking between different forms of representations by the computer can be helpful. To benefit of both, the advantages of the hands and fingers and the automatically linking, we suggest using multi-touch-technology, i.e. computer input devices that are able to recognize several touch gestures at the same time. Here, children can present numbers with their fingers that produce virtual objects. These objects can be automatically linked with the symbolic form of representation.}, Author = {Ladel, Silke and Kortenkamp, Ulrich}, Booktitle = {Proceedings of CERME 7, Rzeszow}, Date-Added = {2010-12-08 18:37:07 +0100}, Date-Modified = {2012-01-30 21:51:57 +0000}, Keywords = {refereed}, Title = {Finger-Symbol-Sets and Multi-Touch for a better understanding of numbers and operations}, Year = {2011}, Bdsk-File-1 = {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}}

@article{RicKor-PSMP-2010, Abstract = {In this article we demonstrate how the combination of a system for dynamic geometry with a freely programmable scripting environment can be advantageously used in teaching and research. We explain the reasons behind various design decisions that were made by us when designing the language CindyScript and give examples that proof how they lead to easy and understandable code that can be used in education. We give several concrete application scenarios of the language that was developed by the authors and seamlessly interacts with the dynamic geometry system Cinderella.}, Author = {Richter-Gebert, J{\"u}rgen and Kortenkamp, Ulrich}, Date-Added = {2010-12-08 17:19:55 +0100}, Date-Modified = {2011-01-28 10:02:14 +0100}, Journal = {Acta Didactica Napocensia}, Keywords = {refereed}, Number = {2}, Pages = {67-78}, Title = {The power of scripting: {DGS} meets programming}, Url = {http://dppd.ubbcluj.ro/adn/article_3_2_7.pdf}, Volume = {3}, Year = {2010}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://dppd.ubbcluj.ro/adn/article_3_2_7.pdf}}

@article{Kor-IIGE-2011, Abstract = {The Intergeo project is driven by a consortium of commercial, semi-commercial and open- source software producers as well as mathematics educators from all over Europe. The primary goal is to make mathematics driven by interactive resources more accessible to all teachers and learners, by facilitating the search, use and quality assurance of them. In this article I will highlight the main obstacles we faced and how we approached them and give an outlook on the future of interactive geometry and the project. Furthermore, I will raise some didactical and research questions that should be answered if we really want to integrate computer-based teaching, learning and assessment into our curricula. This article is a written version of the keynote held at the CADGME 2010 conference in Hluboka, Czech Republic. It does not, cannot and should not contain references for all claims made, but rather summarize the Intergeo project and serve as an introduction to the various publi- cations of the project that are available on its website http://i2geo.net. We refer to those for a much deeper description of each of the issues raised, as well as proper references to existing work.}, Author = {Kortenkamp, Ulrich}, Date-Added = {2010-11-19 16:41:25 +0100}, Date-Modified = {2016-08-11 14:08:13 +0000}, Journal = {The Electronic Journal of Mathematics and Technology}, Keywords = {refereed, intergeo}, Number = {1}, Title = {Interoperable {I}nteractive {G}eometry for {E}urope}, Url = {http://www.radford.edu/ejmt}, Volume = {5}, Year = {2011}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://www.radford.edu/ejmt}}

@inproceedings{AbaBotEscHenKorKreLibMarMer-IFFP-2009, Abstract = {In this paper we describe the ongoing effort to specify a com- mon file format for Interactive or Dynamic Geometry Systems (DGS). Our approach is based on the OpenMath standard, and uses its flexible extension mechanisms like Content Dictionaries. We discuss the various design decisions, the Content Dictionaries that have been defined, as well as open questions to be resolved.}, Author = {Ab{\'a}nades, Miguel and Botana, Francisco and Escribano, Jes{\'u}s and Hendriks, Maxim and Kortenkamp, Ulrich and Kreis, Yves and Libbrecht, Paul and Marques, Daniel and Mercat, Christian}, Booktitle = {Proceedings of the 22nd OpenMath Meeting}, Date-Added = {2010-04-11 22:38:53 +0200}, Date-Modified = {2016-08-11 14:08:45 +0000}, Keywords = {refereed, intergeo}, Title = {The {I}ntergeo File Format in Progress}, Year = {2009}, Bdsk-File-1 = {YnBsaXN0MDDUAQIDBAUGJCVYJHZlcnNpb25YJG9iamVjdHNZJGFyY2hpdmVyVCR0b3ASAAGGoKgHCBMUFRYaIVUkbnVsbNMJCgsMDxJXTlMua2V5c1pOUy5vYmplY3RzViRjbGFzc6INDoACgAOiEBGABIAFgAdccmVsYXRpdmVQYXRoWWFsaWFzRGF0YW8QJgBQAGEAcABlAHIAcwAvAEEAYgBhAwEAbgBhAGQAZQBzAEIAbwB0AGEAbgBhAC0ASQBGAEYAUAAtADIAMAAwADkAYQAuAC4AcABkAGbSFwsYGVdOUy5kYXRhTxECBAAAAAACBAACAAAMTWFjaW50b3NoIEhEAAAAAAAAAAAAAAAAAAAAAAAAAEJEAAH/////HkFih25hZGVzQm90YW5hLUlGRlAtMjAwOWEuLnBkZgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAP////8AAAAAAAAAAAAAAAAAAQADAAAKIGN1AAAAAAAAAAAAAAAAAAZQYXBlcnMAAgB2LzpVc2Vyczp1bGxpOkNsb3Vkc3RhdGlvbjpDbG91ZHN0YXRpb24gVVA6RWlnZW5lIFBhcGVyczpQdWJsaWthdGlvbmVuIHZvbiBVbGxpOlBhcGVyczpBYmHMgW5hZGVzQm90YW5hLUlGRlAtMjAwOWEuLnBkZgAOAEAAHwBBAGIAYQMBAG4AYQBkAGUAcwBCAG8AdABhAG4AYQAtAEkARgBGAFAALQAyADAAMAA5AGEALgAuAHAAZABmAA8AGgAMAE0AYQBjAGkAbgB0AG8AcwBoACAASABEABIAdFVzZXJzL3VsbGkvQ2xvdWRzdGF0aW9uL0Nsb3Vkc3RhdGlvbiBVUC9FaWdlbmUgUGFwZXJzL1B1Ymxpa2F0aW9uZW4gdm9uIFVsbGkvUGFwZXJzL0FiYcyBbmFkZXNCb3RhbmEtSUZGUC0yMDA5YS4ucGRmABMAAS8AABUAAgAL//8AAIAG0hscHR5aJGNsYXNzbmFtZVgkY2xhc3Nlc11OU011dGFibGVEYXRhox0fIFZOU0RhdGFYTlNPYmplY3TSGxwiI1xOU0RpY3Rpb25hcnmiIiBfEA9OU0tleWVkQXJjaGl2ZXLRJidUcm9vdIABAAgAEQAaACMALQAyADcAQABGAE0AVQBgAGcAagBsAG4AcQBzAHUAdwCEAI4A3QDiAOoC8gL0AvkDBAMNAxsDHwMmAy8DNANBA0QDVgNZA14AAAAAAAACAQAAAAAAAAAoAAAAAAAAAAAAAAAAAAADYA==}}

@inproceedings{KorBesSpa-SH-2010, Address = {M{\"u}nster}, Author = {Kortenkamp, Ulrich and Bescherer, Christine and Spannagel, Christian}, Booktitle = {Beitr{\"a}ge zum Mathematikunterricht. Vortr{\"a}ge auf der 44. Tagung f{\"u}r Didaktik der Mathematik in M{\"u}nchen}, Date-Added = {2010-04-07 10:17:16 +0200}, Date-Modified = {2011-04-04 09:55:34 +0000}, Keywords = {invited}, Pages = {61-68}, Publisher = {WTM Verlag}, Title = {Schnittstellenaktivit{\"a}t Hochschul-Mathe\-ma\-tik\-di\-dak\-tik}, Year = {2010}, Bdsk-File-1 = {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}}

@article{KorWinZol-Z-2011, Author = {Kortenkamp, Ulrich and Winter, Christiane and Z{\"o}llner, Johanna}, Date-Added = {2010-04-03 16:03:28 +0200}, Date-Modified = {2014-01-15 16:39:01 +0000}, Journal = {Grundschulunterricht}, Keywords = {lehrer}, Title = {Stein f{\"u}r {S}tein: Mauern bauen -- {S}trukturen erkennen}, Year = {2013}, Bdsk-File-1 = {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}}

@inproceedings{MulKor-LPWR-2010, Abstract = {Introducing students into the fundamentals of programming can still be considered as a real challenge. The choice of the right programming language seems to play a major role. In this paper we present our experiences with the programming language Ruby in introductory programming classes. Ruby is a relatively young programming language, which provides some very interesting aspects and seems like a very good candidate as a beginner's programming language, integrating the advantages of other languages with respect to learning programming, while still being professional enough to support open-ended learning. We discuss several aspects of Ruby that distinguish it from other languages and which make it a good choice for a beginner's course in programming. In addition, we discuss the approaches applied at two different universities in teaching programming with Ruby. We present in some detail the individual programming exercises and present student results. Finally, we discuss the pros and cons for applying Ruby as a first programming language.}, Author = {M{\"u}ller, Wolfgang and Kortenkamp, Ulrich}, Booktitle = {Proceedings of the IFIP Workshop ``New developments in ICT and Informatics education}, Date-Added = {2010-04-03 15:58:20 +0200}, Date-Modified = {2011-01-28 10:02:14 +0100}, Keywords = {refereed}, Organization = {IFIP TC3}, Title = {Learning Programming with {Ruby}}, Year = {2010}, Bdsk-File-1 = {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}}

@unpublished{LibKorMer-CCBWLTIGR-2010, Author = {Libbrecht, Paul and Kortenkamp, Ulrich and Mercat, Christian}, Date-Added = {2010-02-04 19:23:54 +0100}, Date-Modified = {2013-09-16 20:11:02 +0000}, Keywords = {sonstige}, Note = {Unpublished Manuscript}, Title = {Crossing Cultural Boundaries with Long Term Interactive Geometry Resources}, Year = {2010}, Bdsk-File-1 = {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}}

@incollection{BleKor-VSL-2010, Abstract = {VideoClipQuests (VCQs) are a teaching-learning approach focussed on the learner's self-activity while information is collected by searching the Internet, similar to the well- established concept of WebQuests. VCQs can be one element to sensibly integrate the possi- bilities and advantages of the virtual world into teaching. Some of the advantages of VCQs are that they allow the teachers great latitude, they can be created very easily, they are com- patible with a multitude of learning platforms, and they can be used both in e-Learning and traditional lectures. Moreover, they appear to inherently motivate the learners and thus be- come highly accepted. In this chapter we present the concept of a VCQ as well as first evalu- ation results of their influence in learning.}, Author = {Blessing, Axel M. and Kortenkamp, Ulrich}, Booktitle = {Learning and Instruction in the Digital Age: Making a Difference through Cognitive Approaches, Technology-facilitated Collaboration and Assessment, and Personalized Communications}, Chapter = {11}, Date-Added = {2009-05-04 10:29:03 +0200}, Date-Modified = {2011-01-28 10:02:13 +0100}, Editor = {Spector, J. Michael and Ifenthaler, Dirk and Isa{\'\i}as, Pedro and Kinshuk and Sampson, Demetrios G.}, Keywords = {refereed}, Publisher = {Springer-Verlag}, Title = {VideoClipQuests as a New Setup For Learning}, Year = {2010}, Bdsk-File-1 = {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}}

@article{LadKor-VAGKF-2009, Abstract = {Der {\"U}bergang von einem ordinalen Zahlkonzept zu einem strukturierten Zahlbegriff f{\"a}llt manchen Kindern schwer. Wir stellen vor, wie diesen Kindern mit Hilfe des Computers die »Kraft der F{\"u}nf« n{\"a}hergebracht werden kann. Dabei stellt sich als entscheidender Vorteil heraus, dass die Kinder F{\"u}nferp{\"a}ckchen virtueller Pl{\"a}ttchen mit einem »Griff« nehmen k{\"o}nnen, ohne die Pl{\"a}ttchen einzeln abz{\"a}hlen zu m{\"u}ssen, diese aber dennoch auch wieder einzeln gegriffen werden k{\"o}nnen.}, Author = {Ladel, Silke and Kortenkamp, Ulrich}, Date-Added = {2009-05-04 10:27:54 +0200}, Date-Modified = {2011-10-21 08:29:03 +0000}, Journal = {MNUprimar}, Keywords = {refereed}, Title = {Virtuell-enaktives Arbeiten mit der „Kraft der F{\"u}nf}, Year = {2009}, Bdsk-File-1 = {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}, Bdsk-File-2 = {YnBsaXN0MDDUAQIDBAUGJCVYJHZlcnNpb25YJG9iamVjdHNZJGFyY2hpdmVyVCR0b3ASAAGGoKgHCBMUFRYaIVUkbnVsbNMJCgsMDxJXTlMua2V5c1pOUy5vYmplY3RzViRjbGFzc6INDoACgAOiEBGABIAFgAdccmVsYXRpdmVQYXRoWWFsaWFzRGF0YV8QJlBhcGVycy9MYWRlbEtvcnRlbmthbXAtVkFHS0ZrLTIwMDkucGRm0hcLGBlXTlMuZGF0YU8RAgQAAAAAAgQAAgAADE1hY2ludG9zaCBIRAAAAAAAAAAAAAAAAAAAAAAAAABCRAAB/////x9MYWRlbEtvcnRlbmthbXAtVkFHS0ZrLTIwMDkucGRmAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAD/////AAAAAAAAAAQAAAG1AAEAAwAACiBjdQAAAAAAAAAAAAAAAAAGUGFwZXJzAAIAdS86VXNlcnM6dWxsaTpDbG91ZHN0YXRpb246Q2xvdWRzdGF0aW9uIFVQOkVpZ2VuZSBQYXBlcnM6UHVibGlrYXRpb25lbiB2b24gVWxsaTpQYXBlcnM6TGFkZWxLb3J0ZW5rYW1wLVZBR0tGay0yMDA5LnBkZgAADgBAAB8ATABhAGQAZQBsAEsAbwByAHQAZQBuAGsAYQBtAHAALQBWAEEARwBLAEYAawAtADIAMAAwADkALgBwAGQAZgAPABoADABNAGEAYwBpAG4AdABvAHMAaAAgAEgARAASAHNVc2Vycy91bGxpL0Nsb3Vkc3RhdGlvbi9DbG91ZHN0YXRpb24gVVAvRWlnZW5lIFBhcGVycy9QdWJsaWthdGlvbmVuIHZvbiBVbGxpL1BhcGVycy9MYWRlbEtvcnRlbmthbXAtVkFHS0ZrLTIwMDkucGRmAAATAAEvAAAVAAIAC///AACABtIbHB0eWiRjbGFzc25hbWVYJGNsYXNzZXNdTlNNdXRhYmxlRGF0YaMdHyBWTlNEYXRhWE5TT2JqZWN00hscIiNcTlNEaWN0aW9uYXJ5oiIgXxAPTlNLZXllZEFyY2hpdmVy0SYnVHJvb3SAAQAIABEAGgAjAC0AMgA3AEAARgBNAFUAYABnAGoAbABuAHEAcwB1AHcAhACOALcAvADEAswCzgLTAt4C5wL1AvkDAAMJAw4DGwMeAzADMwM4AAAAAAAAAgEAAAAAAAAAKAAAAAAAAAAAAAAAAAAAAzo=}}

@article{Kor-HK-2009, Abstract = {In dem Unterrichtsvorschlag f{\"u}r die Oberstufe werden typische Grundoperationen der linearen Algebra in der Geometrie der Ebene eingesetzt. Grundlage sind die homogenen Koordinaten; ein Punkt in der Ebene wird nun mit drei statt zwei Koordinaten beschrieben. Mit dieser Koordinatenschreibweise k{\"o}nnnen viele Operationen auf Geraden und Punkten mit einfachen Werkzeugen der linearen Algebra - Skalarprodukt, Kreuzprodukt und Determinante - ausgef{\"u}hrt werden. Die Behandlung von Sonderf{\"a}llen wird vollst{\"a}ndig verzichtbar und auch das Unendliche wird handlich. Mit dem homogenen Koordinatensystem kann eine Verbindung von linearer Algebra und analytischer Geometrie mit moderner Mathematik, wie sie etwa in der Computergrafik notwendig ist, geschaffen werden.

}, Author = {Kortenkamp, Ulrich}, Date-Added = {2009-05-04 10:26:37 +0200}, Date-Modified = {2014-12-03 08:08:41 +0000}, Journal = {mathematik lehren}, Journaltitle = {mathematik lehren}, Keywords = {lehrer}, Pages = {55-57}, Title = {{H}omogene {K}oordinaten}, Volume = {154}, Year = {2009}, Bdsk-File-1 = {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}}

@inproceedings{FesKor-POLEIGL-2009, Abstract = {Based on the interactive geometry software Cinderella we developed a learning environment to be used for teaching geometry at university level. Following the ideas of the constructivist learning theory the software allows for learning by discovery. The activities are implemented in a process-oriented design. Our software supports both the learning of mathematical processes by the students and analysing their process of learning mathematics. In this paper we focus on a particular learning unit on congruencies and line reflections. By varying the axes of reflection, students can study the reduction theorems for geometric transformations. Different directly given or subliminal hints help the students to understand the mathematical principles behind these theorems. Our tool analyses the student's solution processes automatically and generates feedback on demand to the students. This learning environment can be used in conjunction with the recording of user actions. Our final goal is to be able to analyse learning processes of students using the tool semi- automatically and use this information to improve teaching and learning.}, Address = {Metz}, Author = {Fest, Andreas and Kortenkamp, Ulrich}, Booktitle = {Proceedings of the 9th International Conference on Technology in Mathematics Teachingh International Conference on Technology in Mathematics Teaching}, Date-Added = {2009-05-04 10:23:53 +0200}, Date-Modified = {2014-09-15 10:14:39 +0000}, Editor = {Bardini, C. and Fortin, C. and Oldknow, Adrian and Vagost, D.}, Keywords = {refereed, process assessment}, Publisher = {ICTMT-9}, Title = {Process Orientated Learning Environments For Interactive Geometry Lessons}, Year = {2009}, Bdsk-File-1 = {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}}

@inproceedings{El-Kor-EEPUDGSDMGSGC-2009, Abstract = {The research work presented in this paper was guided by three goals: First, to identify the principles of preparing an enrichment program in Euclidean geometry using Dynamic Geometry Software to develop the mathematically gifted students' geometric creativity in high schools, second, to develop an enrichment program based on the identified principles, and third, to investigate its effectiveness by testing it with high school students. The enrichment program was administered to 7 mathematically gifted students in 12 weekly 90-minute sessions. Results of a pre-post measurements revealed the effectiveness of the program in developing the subjects' geometric creativity as a whole ability and its four sub-components (fluency, flexibility, originality, and elaboration).}, Address = {Metz}, Author = {El-Demerdash, Mohamed and Kortenkamp, Ulrich}, Booktitle = {Proceedings of the 9th International Conference on Technology in Mathematics Teaching}, Date-Added = {2009-05-04 10:19:33 +0200}, Date-Modified = {2011-01-28 10:02:13 +0100}, Editor = {Bardini, C. and Fortin, C. and Oldknow, Adrian and Vagost, D.}, Keywords = {refereed}, Publisher = {ICTMT-9}, Title = {The Effectiveness of an Enrichment Program Using Dynamic Geometry Software in Developing Mathematically Gifted Students' Geometric Creativity}, Year = {2009}, Bdsk-File-1 = {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}}

@inproceedings{SpaKor-DGAPDGS-2009, Abstract = {Process-oriented mathematics education focuses on learning processes rather than on their outcomes only. These processes should be monitored, guided and supported by the teacher. In addition, feedback should be given on the students' activities, not only on their results. Groups of 30 (school) up to more than 600 (university) learners render it impossible to support processes without appropriate technology. This paper describes the tool CleverPHL that allows for designing process-oriented learning scenarios: processes can be recorded, replayed, completed, guided, and analyzed. These features are demonstrated with dynamic geometry systems (DGS).}, Address = {Metz}, Author = {Spannagel, Christian and Kortenkamp, Ulrich}, Booktitle = {Proceedings of the 9th International Conference on Technology in Mathematics Teaching}, Date-Added = {2009-05-04 10:18:28 +0200}, Date-Modified = {2014-09-15 10:14:50 +0000}, Editor = {Bardini, C. and Fortin, C. and Oldknow, Adrian and Vagost, D.}, Keywords = {refereed; process assessment}, Publisher = {ICTMT-9}, Title = {Demonstrating, Guiding, and Analyzing Processes in Dynamic Geometry Systems}, Year = {2009}, Bdsk-File-1 = {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}}

@inproceedings{KorRol-GBEWAGDDCS-2009, Abstract = {Mit Hilfe von Boxplots lassen sich Datenreihen in aufschlussreicher Form visualisieren. Allerdings sind die Informationen, die in der grafischen Dar- stellung als Boxplot {\"u}bermittelt werden, auf gewisse Aspekte beschr{\"a}nkt. Bakker, Biehler und Konold (2004) stellen beispielsweise fest, dass der Umgang mit und das Verst{\"a}ndnis von Boxplots insbesondere f{\"u}r j{\"u}ngere Sch{\"u}lerinnen und Sch{\"u}ler mit nicht unerheblichen Schwierigkeiten verbun- den ist. Ziel unserer Arbeit ist es nicht, dass die Sch{\"u}lerinnen und Sch{\"u}ler Boxplots besser oder einfacher erstellen k{\"o}nnen. Durch die Vereinfachung der Erstellung von Boxplots mit Hilfe eines Applets1 und die darauf abge- stimmten {\"U}bungen sollen die Sch{\"u}lerinnen und Sch{\"u}ler vielmehr in die Lage versetzt werden, Boxplots zu interpretieren und dadurch Informatio- nen {\"u}ber die Verteilung der zugrunde liegenden Datenmenge erschlie{\ss}en zu k{\"o}nnen.}, Author = {Kortenkamp, Ulrich and Rolka, Katrin}, Booktitle = {Beitr{\"a}ge zum Mathematikunterricht. Vortr{\"a}ge auf der 43. Tagung f{\"u}r Didaktik der Mathematik in Oldenburg}, Date-Added = {2009-05-04 10:15:50 +0200}, Date-Modified = {2011-10-21 08:28:14 +0000}, Keywords = {invited}, Title = {„Der Boxplot ist nur von einzelnen Werten abh{\"a}ngig -- Dateninterpretation durch Computereinsatz schulen}, Url = {http://www.mathematik.tu-dortmund.de/ieem/cms/media/BzMU/BzMU2009/Beitraege/KORTENKAMP_Ulrich_ROLKA_Katrin_2009_Boxplots.pdf}, Year = {2009}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://www.mathematik.tu-dortmund.de/ieem/cms/media/BzMU/BzMU2009/Beitraege/KORTENKAMP_Ulrich_ROLKA_Katrin_2009_Boxplots.pdf}}

@article{KorDoh-UIDDGS-2010, Abstract = {In this article we describe long-standing user interface issues with Dynamic Geometry Software and common approaches to address them. We describe first prototypes of multi-touch- capable DGS. We also give some hints on the educational benefits of proper user interface design.}, Author = {Kortenkamp, Ulrich and Dohrmann, Christian}, Booktitle = {Proceedings of CADGME 2009}, Date-Added = {2009-05-04 10:14:27 +0200}, Date-Modified = {2011-03-17 11:09:51 +0000}, Journal = {Acta Didactica Napocensia}, Keywords = {refereed}, Number = {2}, Pages = {59-66}, Title = {User Interface Design for {D}ynamic {G}eometry Software}, Url = {http://dppd.ubbcluj.ro/adn/article_3_2_6.pdf}, Volume = {3}, Year = {2010}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://dppd.ubbcluj.ro/adn/article_3_2_6.pdf}}

@inproceedings{KorRic-BEW-2009, Abstract = {Experimentation is an important element of science teaching. Students should experience real-world phenomena, and support or disprove their hypotheses about the world by setting up appropriate situations, conducting the experiments, gathering data and drawing conclusions. Unfortunately, many experiments are unsuitable for school teaching out of various reasons. They might be too dangerous, too expensive, too complex, too unreliable, or they take too much time to complete. Using simulation software, many experiments can be replaced by safer, cheaper, easier, more reliable or sped-up virtual counterparts. Such simulations range from showing videos of repeated runs of the real experiment, together with interaction facilities, to mathematical simulations using numerical solutions of partial differential equations. However, there is a pedagogical drawback of the simulation approach: The connection to the real world situation is (at least partially) lost. This might harm both the motivation of the students and their belief in the conclusions. In this paper we describe the approach of blended experimentation, where simulations and the real world are connected via sensors and actors. The sensors are able to influence the simulation, while the actors can change the real world. We show first implementations and examples using Dynamic Geometry Software and other Mathematical Software as simulation environments.}, Author = {Kortenkamp, Ulrich and Richter-Gebert, J{\"u}rgen}, Booktitle = {Proceedings of CADGME 2009}, Date-Added = {2009-05-04 10:11:17 +0200}, Date-Modified = {2012-01-08 16:04:17 +0000}, Keywords = {refereed}, Title = {Blended Experimentation with DGS}, Url = {http://www.risc.jku.at/conferences/cadgme2009/?content=proceedings}, Year = {2009}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://www.risc.jku.at/conferences/cadgme2009/?content=proceedings}}

@techreport{RicKor-GEI-1997, Author = {Richter-Gebert, J{\"u}rgen and Kortenkamp, Ulrich}, Date-Added = {2008-12-15 13:46:15 +0100}, Date-Modified = {2011-01-28 10:02:14 +0100}, Institution = {ETH Z{\"u}rich}, Keywords = {invited}, Title = {Geometry and education in the {I}nternet age}, Type = {Gr{\"u}ne Berichte}, Year = {1997}, Bdsk-File-1 = {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}}

@inproceedings{KorBleDohKreLibMer-IIGEFTERFCIP-2009, Abstract = {In this overview article we describe the manifold achievements and challenges of Intergeo, a project co-funded within the eContentplus programme2 of the European Union.}, Address = {Lyon (France)}, Author = {Kortenkamp, Ulrich and Blessing, Axel M. and Dohrmann, Christian and Kreis, Yves and Libbrecht, Paul and Mercat, Christian}, Booktitle = {Proceedings of the Sixth Congress of the European Society for Research in Mathematics Education. January 28th - February 1st 2009, Lyon (France)}, Date-Added = {2008-09-30 20:55:32 +0200}, Date-Modified = {2016-08-11 14:08:53 +0000}, Keywords = {refereed, intergeo}, Month = {January}, Organization = {Proceedings of the Sixth Congress of the European Society for Research in Mathematics Education}, Title = {Interoperable Interactive Geometry For Europe -- First Technological and Educational Results and Future Challenges of the Intergeo Project}, Url = {http://www.inrp.fr/publications/edition-electronique/cerme6/wg7-11-kortenkamp.pdf}, Year = {2009}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://www.inrp.fr/publications/edition-electronique/cerme6/wg7-11-kortenkamp.pdf}}

@inproceedings{KorRol-UTTLP-2009, Abstract = {Box plots (or box-and-whisker-plots) can be used as a powerful tool for visualising sets of data values. Nevertheless, the information conveyed in the representation of a box plot is restricted to certain aspects. In this paper, we discuss both the potential and limitations of box plots. We also present a design for an empirical study in which the use of a variety of tasks explicitly addresses this duality. The activities used in the study are based on an interactive box plot applet that surpasses the currently available tools and offers new ways of experiencing box plots.}, Author = {Kortenkamp, Ulrich and Rolka, Katrin}, Booktitle = {Proceedings of the Sixth Congress of the European Society for Research in Mathematics Education. January 28th - February 1st 2009, Lyon (France)}, Date-Added = {2008-09-30 20:53:16 +0200}, Date-Modified = {2011-01-28 10:02:14 +0100}, Editor = {Durand-Guerrier, Viviane and Soury-Lavergne, Sophie and Arzarello, Ferdinando}, Keywords = {refereed}, Title = {Using Technology in the Teaching and Learning of Box Plots}, Url = {http://www.inrp.fr/publications/edition-electronique/cerme6/wg7-03-kortenkamp-rolka.pdf}, Year = {2009}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://www.inrp.fr/publications/edition-electronique/cerme6/wg7-03-kortenkamp-rolka.pdf}}

@incollection{RicKor-ZMA-2008, Abstract = {Das Verh{\"a}ltnis von Mathematik und Architektur ist ein spannungsreiches Wechselspiel von Inspiration und Emanzipation, Notwendigkeit und gestalterischer Freiheit, Formenvielfalt und Beschr{\"a}nkung auf das Wesentliche. W{\"a}hrend es in der Mathematik die M{\"o}glichkeit gibt, Strukturen losgel{\"o}st von materiellen Beschr{\"a}nkungen zu studieren, ist die Architektur dazu „verdammt`` umsetzbar sein zu m{\"u}ssen. Der Mathematik wird dadurch in der Architektur eine doppelte Rolle zuteil. Einerseits ist die Mathematik als Grundlage von Baustatik, Materialphysik und r{\"a}umlicher Formgebung oftmals notwendiger Pr{\"u}fstein der Umsetzbarkeit. Dabei erm{\"o}glichen heute neue mathematische Techniken, insbesondere unter der Einbeziehung von Computern, auch die Umsetzung von neuen Geb{\"a}udekonzepten.}, Author = {Richter-Gebert, J{\"u}rgen and Kortenkamp, Ulrich}, Booktitle = Vorlage:$\pi$ und Co., Chapter = {V.3}, Date-Added = {2008-09-28 09:21:08 +0200}, Date-Modified = {2011-01-28 10:02:14 +0100}, Doi = {10.1007/978-3-540-77889-9_36}, Editor = {Behrends, Ehrhard and Gritzmann, Peter and Ziegler, G{\"u}nter}, Keywords = {invited}, Pages = {342--349}, Publisher = {Springer-Verlag}, Title = {Zusammenspiel: Mathematik und {A}rchitektur}, Url = {http://www.springerlink.com/content/q2713783j150p730/}, Year = {2008}, Bdsk-Url-1 = {http://www.springerlink.com/content/q2713783j150p730/}, Bdsk-Url-2 = {http://dx.doi.org/10.1007/978-3-540-77889-9_36}}

@inproceedings{LadKor-RMMERMMELREMS-2009, Abstract = {Assumptions of multiple mental representations lead to the presumption of an enhanced mathematical learning, especially of the process of internalization, due to MERs (Ainsworth 1999) and MELRs (Harrop 2003). So far, most educational software for mathematics at the primary level aims to help children to automatize mathematical operations, whereby symbolical representations are dominating. However, what is missing is software and principles for its design that support the process of internalization and the learning of external representations and their meaning themselves -- in primary school these are in particular symbols. This paper summarizes the current state of research and presents a prototype that aims to the above-mentioned purpose.}, Author = {Ladel, Silke and Kortenkamp, Ulrich}, Booktitle = {Proceedings of the Sixth Congress of the European Society for Research in Mathematics Education. January 28th - February 1st 2009, Lyon (France)}, Date-Added = {2008-09-20 12:24:38 +0200}, Date-Modified = {2011-01-28 10:02:14 +0100}, Editor = {Durand-Guerrier, Viviane and Soury-Lavergne, Sophie and Arzarello, Ferdinando}, Keywords = {refereed}, Title = {Realisations of {MERS} (Multiple Extern Representations) and {MELRS} (Multiple Equivalent Linked Representations) in Elementary Mathematics Software}, Url = {http://www.inrp.fr/publications/edition-electronique/cerme6/wg7-01-ladel.pdf}, Year = {2009}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://www.inrp.fr/publications/edition-electronique/cerme6/wg7-01-ladel.pdf}}

@inproceedings{KorFes-FCIAEMS-2008, Abstract = {The standard triumvirate of ``New Media in the mathematics curriculum -- CAS, DGS and spreadsheet -- is establishing its secured position in teaching. This article illustrates, using the evolution of the software Cinderella as a guiding example, how a further inte- gration of these products will allow for new teaching approaches. These will support the formation of important mathematical competencies, such as the ability to find and rate mathematical models for real world problems. A central observation is the algorithmic nature of user-defined functions and that it is crucial for the learning process to be able to execute algorithms step by step.}, Author = {Kortenkamp, Ulrich and Fest, Andreas}, Booktitle = {Proceedings of ATCM 08}, Date-Added = {2008-09-15 17:16:21 +0200}, Date-Modified = {2011-01-28 10:02:14 +0100}, Keywords = {refereed}, Title = {From {CAS/DGS} Integration to Algorithms in Educational Math Software}, Year = {2008}, Bdsk-File-1 = {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}}

@inproceedings{BleKor-EVM-2008, Address = {Klagenfurt}, Author = {Blessing, Axel M. and Kortenkamp, Ulrich}, Booktitle = {Vortr{\"a}ge auf der 5. Internationalen Moodle Konferenz 2008 in Klagenfurt}, Date-Added = {2008-07-31 20:34:04 +0200}, Date-Modified = {2011-01-28 10:02:13 +0100}, Keywords = {refereed}, Title = {Der {E}insatz von {V}ideo{C}lip{Q}uests in {M}oodle}, Url = {http://moodlemoot.at/moodle/mod/data/view.php?d=2&rid=22}, Year = {2008}, Bdsk-Url-1 = {http://moodlemoot.at/moodle/mod/data/view.php?d=2&rid=22}}

@inproceedings{BleKor-VSL-2008, Abstract = {VideoClipQuests -- in short: VCQs -- are a teaching-learning-approach focussed on the learner's self-activity while infor- mation is collected by searching the Internet, similar to the well-established concept of WebQuests. VCQs can be one element to sensibly integrate the possibilities and advantages of the virtual world into teaching. Some of the advantages of VCQs are that they allow the teacher great latitude, they can be created very easily, they are compatible with a multi- tude of learning platforms, and they can be used both in e-learning and traditional lectures. Moreover, they appear to inherently motivate the learners and thus become highly accepted. In this paper we present the concept of a VCQ as well as first evaluation results of their influence to learning.}, Address = {Freiburg}, Author = {Blessing, Axel and Kortenkamp, Ulrich}, Booktitle = {Proceedings of the IADIS International Conference on Cognition and Exploratory Learning in Digital Age (CELDA 2008)}, Date-Added = {2008-07-26 21:50:29 +0200}, Date-Modified = {2011-01-28 10:02:13 +0100}, Editor = {Kinshuk and Sampson, Demetrios G. and Spector, J. Michael and Isa{\'\i}as, Pedro and Ifenthaler, Dirk}, Keywords = {refereed}, Month = {10}, Organization = {IADIS}, Pages = {343--346}, Title = {VideoClipQuests as a New Setup For Learning}, Year = {2008}, Bdsk-File-1 = {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}}

@inproceedings{BleKor-VEP-2009, Author = {Blessing, Axel and Kortenkamp, Ulrich}, Booktitle = {Proceedings of the E-Learning Patterns Workshop 2009}, Date-Added = {2008-07-26 21:49:41 +0200}, Date-Modified = {2011-01-28 10:02:13 +0100}, Keywords = {refereed}, Title = {VideoClipQuests as an E-Learning Pattern}, Year = {2009}}

@article{KorMul-DHU-2008, Abstract = {Welche Besonderheiten haben Dozierende zu beachten, die Lehrveranstaltungen in Second Life anbieten m{\"o}chten? Die Autoren berichten {\"u}ber erste Erfahrungen mit dieser virtuellen Welt und ihrem Einsatz in der Lehre }, Author = {Kortenkamp, Ulrich and M{\"u}ller, Wolfgang}, Date-Added = {2008-07-15 17:43:46 +0200}, Date-Modified = {2011-01-28 10:02:14 +0100}, Journal = {Online Tutoring Journal}, Keywords = {invited}, Month = {7}, Number = {10}, Title = {Wo ist denn hier das {U}ndo?}, Url = {http://www.online-tutoring-journal.de/ausgabejuli08/kortenkamp1.htm}, Volume = {3}, Year = {2008}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://www.online-tutoring-journal.de/ausgabejuli08/kortenkamp1.htm}}

@inproceedings{Kor-AM-2008, Author = {Kortenkamp, Ulrich}, Booktitle = {Informatische Ideen im Mathematikunterricht. Bericht {\"u}ber die 23. Arbeitstagung des Arbeitskreises Mathematikunterricht und Informatik}, Date-Added = {2008-03-30 22:15:18 +0200}, Date-Modified = {2011-10-21 08:28:32 +0000}, Editor = {Kortenkamp, Ulrich and Weigand, Hans-Georg and Weth, Thomas}, Keywords = {invited}, Pages = {77--86}, Publisher = {Franzbecker}, Title = {Algorithmen im Mathematikunterricht}, Year = {2008}, Bdsk-Url-1 = {http://www.didaktik-der-mathematik.de/ak/mui/tagungsbaende/Tagungsband2005.pdf}}

@proceedings{KorWeiWet-IIMBU2AAGI-2008, Address = {Hildesheim}, Date-Added = {2008-03-30 22:06:38 +0200}, Date-Modified = {2011-10-21 08:28:50 +0000}, Editor = {Kortenkamp, Ulrich and Weigand, Hans-Georg and Weth, Thomas}, Isbn = {978-3-88120-471-2}, Keywords = {herausgeber}, Publisher = {Franzbecker}, Read = {Yes}, Title = {Informatische Ideen im Mathematikunterricht. Bericht {\"u}ber die 23. Arbeitstagung des Arbeitskreises Mathematikunterricht und Informatik}, Url = {http://www.didaktik-der-mathematik.de/ak/mui/tagungsbaende/Tagungsband2005.pdf}, Year = {2008}, Bdsk-Url-1 = {http://www.didaktik-der-mathematik.de/ak/mui/tagungsbaende/Tagungsband2005.pdf}}

@online{RicKor-COGP-2008, Author = {Richter-Gebert, J{\"u}rgen and Kortenkamp, Ulrich}, Date-Added = {2008-01-30 10:51:05 +0100}, Date-Modified = {2011-04-04 10:06:19 +0000}, Editor = {Greuel, Gert-Martin}, Keywords = {sonstige}, Subtitle = {Beitrag im Rahmen der Ausstellung Imaginary}, Title = {Cinderella -- {O}nline-{E}xperimente der {G}eometrie und {P}hysik}, Url = {http://www.imaginary2008.de}, Year = {2008}, Bdsk-Url-1 = {http://www.imaginary2008.de}}

@inproceedings{KorKre-IIIGE-2008, Author = {Kortenkamp, Ulrich and Kreis, Yves}, Booktitle = {Beitr{\"a}ge zum Mathematikunterricht. Vortr{\"a}ge auf der 42. Tagung f{\"u}r Didaktik der Mathematik in Budapest}, Date-Added = {2008-01-29 22:30:01 +0100}, Date-Modified = {2016-08-11 14:08:40 +0000}, Keywords = {invited, intergeo}, Organization = {Tagung f{\"u}r Didaktik der 42. Mathematik in Budapest}, Title = {Intergeo -- {I}nteroperable {I}nteractive {G}eometry for {E}urope}, Url = {http://www.mathematik.tu-dortmund.de/ieem/cms/media/BzMU/BzMU2008/BzMU2008/BzMU2008_KORTENKAMP_Ulrich%20_%20KREIS_Yves.pdf}, Year = {2008}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://www.mathematik.tu-dortmund.de/ieem/cms/media/BzMU/BzMU2008/BzMU2008/BzMU2008_KORTENKAMP_Ulrich%20_%20KREIS_Yves.pdf}}

@misc{Kor-MUTATT-2008, Author = {Kortenkamp, Ulrich}, Date-Added = {2008-01-29 22:20:34 +0100}, Date-Modified = {2011-01-28 10:02:13 +0100}, Editor = {Laborde, Colette}, Howpublished = {poster presentation at ICME-11}, Keywords = {poster}, Title = {Math Unit Testing -- A New Approach to the Use of Technology in Teaching}, Year = {2008}}

@article{FesKor-TGAWV-2009, Abstract = {Combinatorial optimization is a substantial pool for teaching authentic math- ematics. Studying topics in combinatorial optimization practice different mathematical skills, and because of this have been integrated into the new Berlin curriculum for sec- ondary schools. In addition, teachers are encouraged to use adequate teaching software. The presented software package ``Visage is a visualization tool for graph algo- rithms. Using the intuitive user interface of an interactive geometry system (Cinderella), graphs and networks can be drawn very easily and different textbook algorithms can be visualized on the graphs. An authoring tool for interactive worksheets and the usage of the build-in programming interface offer new ways for teaching graphs and algorithms in a classroom.}, Author = {Fest, Andreas and Kortenkamp, Ulrich}, Date-Added = {2008-01-29 22:08:11 +0100}, Date-Modified = {2011-01-28 10:02:13 +0100}, Journal = {Teaching Mathematics and Computer Science}, Keywords = {refereed}, Number = {1}, Pages = {35-50}, Title = {Teaching Graph Algorithms with Visage}, Url = {http://tmcs.math.klte.hu/Contents/2009-Vol-VII-Issue-I.html}, Volume = {7}, Year = {2009}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://tmcs.math.klte.hu/Contents/2009-Vol-VII-Issue-I.html}}

@inproceedings{Kor-TBADMC-2008, Abstract = {In this article we describe a new approach to teaching discrete mathematics, in particular graph theory and graph algorithms, using interactive geometry software. Students are encouraged to use the computer to explore and verify their theories using a computer, and use it as a tool for modeling real-life situations.}, Address = {Monterrey, Mexico}, Author = {Kortenkamp, Ulrich}, Booktitle = {Proceedings of ICME-11, TSG 15}, Date-Added = {2008-01-29 21:53:38 +0100}, Date-Modified = {2011-01-28 10:02:14 +0100}, Editor = {Campbell, Stephen and Grenier, Denise}, Keywords = {refereed}, Title = {A Technology Based Approach to Discrete Mathematics in the Classroom}, Url = {http://tsg.icme11.org/document/get/765}, Year = {2008}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://tsg.icme11.org/document/get/765}}

@article{KorRic-CGPD-2008, Author = {Kortenkamp, Ulrich and Richter-Gebert, J{\"u}rgen}, Date-Added = {2008-01-04 04:18:25 +0100}, Date-Modified = {2011-04-04 10:00:49 +0000}, Journal = {Computer\-al\-gebra-Rund\-brief}, Keywords = {lehrer}, Read = {Yes}, Title = {Cinderella.2 -- Geometrie und Physik im Dialog}, Url = {http://kortenkamps.net/papers/2008/Rundbrief-CA-Kortenkamp.pdf}, Year = {2008}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://kortenkamps.net/papers/2008/Rundbrief-CA-Kortenkamp.pdf}}

@inproceedings{FesKor-TGAWV-2007, Author = {Fest, Andreas and Kortenkamp, Ulrich}, Booktitle = {Proceedings of CADGME 2007 in P{\'e}cs}, Date-Added = {2007-10-05 15:57:14 +0200}, Date-Modified = {2011-01-28 10:02:13 +0100}, Editor = {S{\'a}rv{\'a}ri, Csaba and Lavicza, Zsolt}, Keywords = {invited}, Month = {6}, Title = {Teaching Graph Algorithms with {V}isage}, Year = {2007}}

@inproceedings{SpaKor-PBLAWA-2007, Address = {Hildesheim, Berlin}, Author = {Spannagel, Christian and Kortenkamp, Ulrich}, Booktitle = {Tagungsband des Arbeitskreis Geometrie der GDM}, Date-Added = {2007-07-18 11:40:02 +0200}, Date-Modified = {2014-09-15 10:15:38 +0000}, Editor = {Ludwig, Matthias}, Keywords = {refereed; process assessment}, Publisher = {Franzbecker}, Title = {Prozesse beim {L}ernen mit {DGS}: {A}ufzeichnung, {W}iedergabe, {A}nalyse}, Year = {2007}, Bdsk-File-1 = {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}}

@inproceedings{Kor-GUCCME-2007, Abstract = {Computers are the ultimate tool for teaching: They provide mi- croworlds that can be explored; they can be forgiving and strict; they take ac- count of everything that's happening; they can create maps of what the learner knows or still has to learn; they are fun to use; they provide interactive illustra- tions that enlighten those who use them --- or at least, that's what they could be or do. There are significant drawbacks: many people do not know what they could do with them; if they know it, they probably do not know how to make them do it; and, finally, it is not validated whether it is of any didactic value to use them in the way they are used. In this text, we present some basic guidelines that can help in designing and evaluating electronic material. Starting from an example, we identify some roles the computer can take and discuss their implications for the development of mathematics tools.}, Author = {Kortenkamp, Ulrich}, Booktitle = {Enhancing University Mathematics: Proceedings of the First KAIST International Symposium on Teaching}, Date-Added = {2007-07-06 17:32:48 +0200}, Date-Modified = {2011-01-28 10:02:13 +0100}, Editor = {Ko, Ki Hyoung and Arganbright, Deane}, Keywords = {refereed}, Pages = {129--138}, Publisher = {AMS}, Series = {CBMS Issues in Mathematics Education}, Title = {Guidelines for Using Computers Creatively in Mathematics Education}, Url = {http://www.ams.org/bookstore?fn=20&arg1=cbmathseries&item=CBMATH-14}, Volume = {14}, Year = {2007}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://www.ams.org/bookstore?fn=20&arg1=cbmathseries&item=CBMATH-14}}

@inproceedings{Kor-RGS-2007, Address = {Hildesheim}, Author = {Kortenkamp, Ulrich}, Booktitle = {Beitr{\"a}ge zum Mathematikunterricht. Vortr{\"a}ge auf der 41. Tagung f{\"u}r Didaktik der Mathematik}, Date-Added = {2007-07-03 16:49:23 +0200}, Date-Modified = {2011-01-28 10:02:14 +0100}, Keywords = {invited}, Publisher = {Franzbecker}, Title = {Zur {R}eaktivierung der {G}eometrie in der {S}chule}, Url = {http://www.mathematik.tu-dortmund.de/ieem/cms/media/BzMU/BzMU2007/Kortenkamp%202.pdf}, Year = {2007}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://www.mathematik.tu-dortmund.de/ieem/cms/media/BzMU/BzMU2007/Kortenkamp%202.pdf}}

@inproceedings{Kor-DOWBM-2007, Address = {Hildesheim}, Author = {Kortenkamp, Ulrich}, Booktitle = {Beitr{\"a}ge zum Mathematikunterricht. Vortr{\"a}ge auf der 41. Tagung f{\"u}r Didaktik der Mathematik in Berlin}, Date-Added = {2007-07-03 16:48:40 +0200}, Date-Modified = {2011-01-28 10:02:13 +0100}, Keywords = {invited}, Publisher = {Franzbecker}, Title = {{CAS} und {DGS} im {D}ialog -- oder: Wieviel {CAS} braucht der {M}ensch?}, Url = {http://www.mathematik.tu-dortmund.de/ieem/cms/media/BzMU/BzMU2007/Kortenkamp.pdf}, Year = {2007}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://www.mathematik.tu-dortmund.de/ieem/cms/media/BzMU/BzMU2007/Kortenkamp.pdf}}

@incollection{Kor-PA-2007, Address = {Hildesheim}, Author = {Kortenkamp, Ulrich}, Booktitle = {Lernen mit Dynamischen Geometriesystemen}, Date-Added = {2007-07-03 16:40:39 +0200}, Date-Modified = {2011-01-28 10:02:14 +0100}, Editor = {Beckmann, Astrid}, Keywords = {refereed}, Pages = {5-28}, Publisher = {Franzbecker}, Series = {Ausgew{\"a}hlte Unterrichtskonzepte im Mathematikunterricht in unterrichtlicher Erprobung}, Title = {Punkt- und {A}chsenspiegelungen mit {DGS}}, Volume = {3}, Year = {2007}, Bdsk-File-1 = {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}, Bdsk-File-2 = {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}}

@inproceedings{Kor-PAEWQT-2006, Abstract = {In this paper we describe a mathematical approach to create an organic, yet efficient to create tiling for a large non-rectangular space, the Alexanderplatz in Berlin. We show how to use the refinement algorithm for Penrose tilings in order to create a polygonal tiling that consist of four different tiles and is quasi-periodic. We also derive, based on the refinement algorithm, bounds for the percentage of tiles of each type needed.

Another question that is addressed is whether it is possible to describe the calculated tiling in a linear form. Otherwise, it wouldn't be possible to use the tiling, as there must be a concise description suitable for the workers who lay out the concrete tiles.}, Address = {Turin}, Author = {Kortenkamp, Ulrich}, Booktitle = {Nexus VI: Architecture and Mathematics}, Date-Added = {2007-07-03 15:57:59 +0200}, Date-Modified = {2011-01-28 10:02:14 +0100}, Editor = {Duvernoy, Sylvie and Pedemonte, Orietta}, Keywords = {refereed}, Pages = {57-62}, Publisher = {Kim Williams Books}, Title = {Paving the {A}lexanderplatz Efficiently with a quasi-periodic tiling}, Url = {http://www.nexusjournal.com/the-nexus-conferences/nexus-2006/171-n2006-kortenkamp.html}, Year = {2006}, Bdsk-Url-1 = {http://www.nexusjournal.com/the-nexus-conferences/nexus-2006/171-n2006-kortenkamp.html}}

@techreport{KirNorRudSabUlr-EAFMNU-2003, Author = {Kirstein, J{\"u}rgen and Nordmeier, Volkhard and Rudolf, Rass and Sabina, Jeschke and Ulrich, Kortenkamp}, Date-Added = {2007-07-03 15:49:43 +0200}, Date-Modified = {2011-01-28 10:02:13 +0100}, Institution = {Senatsverwaltung Bildung, Jugend Sport, Berlin}, Keywords = {invited}, Month = {11}, Title = {Empfehlungen zur {A}usstattung von {F}achraum-{M}edieninseln f{\"u}r den mathematischen und naturwissenschaftlichen {U}nterricht}, Year = {2003}}

@article{RicKor-ZMA-2004, Author = {Richter-Gebert, J{\"u}rgen and Kortenkamp, Ulrich}, Date-Added = {2007-07-03 15:47:56 +0200}, Date-Modified = {2011-01-28 10:02:14 +0100}, Journal = {aviso - Zeitschrift f{\"u}r Wissenschaft und Kunst in Bayern}, Keywords = {invited}, Pages = {26--33}, Title = {Zusammenspiel: Mathematik und Architektur}, Url = {http://www.stmwfk.bayern.de/kunst/aviso/aviso1_2004_26-33.pdf}, Volume = {1}, Year = {2004}, Bdsk-Url-1 = {http://www.stmwfk.bayern.de/kunst/aviso/aviso1_2004_26-33.pdf}}

@article{Kor-TEKS-2006, Address = {Seelze}, Author = {Kortenkamp, Ulrich}, Date-Added = {2007-07-03 15:38:25 +0200}, Date-Modified = {2011-01-28 10:02:14 +0100}, Journal = {mathematik lehren}, Keywords = {lehrer}, Language = {german}, Number = {5}, Pages = {13}, Publisher = {Friedrich Verlag}, Title = {Terme erklimmen. {K}lammergebirge als {S}trukturierungshilfe}, Volume = {136}, Year = {2006}}

@inproceedings{Kor-EP-2005, Abstract = {In diesem Artikel werden zwei Erweiterungen Dynamischer Geometrie-Software (DGS) vorgestellt, die bisher vorhandene L{\"u}cken schlie{\ss}en und neue didaktische Impulse geben k{\"o}nnen. Zum einen wird die Unterst{\"u}tzung von Algorithmen in DGS und die Erweiterung durch selbst geschriebene Module beschrieben, wie sie bereits prototypisch in Cinderella implementiert ist. Zum anderen wird CINErella vorgestellt, eine Kombination aus Interaktion und Film, die sich zum Beispiel f{\"u}r die Dokumentation von Forschungsarbeit mit der DGS eignet. }, Address = {Hildesheim}, Author = {Kortenkamp, Ulrich}, Booktitle = {WWW und Mathematik - Lehren und Lernen im Internet, Tagungsband der 21. Arbeitstagung des Arbeitskreis Mathematikunterricht und Informatik in Dillingen/Donau}, Date-Added = {2007-07-03 15:33:31 +0200}, Date-Modified = {2011-01-28 10:02:13 +0100}, Editor = {Bender, Peter and Herget, Wilfried and Weigand, Hans-Georg and Weth, Thomas}, Keywords = {invited}, Pages = {120-126}, Publisher = {Franzbecker}, Title = {Experimentieren und Publizieren}, Url = {http://kortenkamps.net/papers/2005/Dillingen03.pdf}, Year = {2005}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://kortenkamps.net/papers/2005/Dillingen03.pdf}}

@incollection{Kor-DDPWKGI-2005, Abstract = {Neue Medien sind nicht nur technisches Spiel- zeug, sondern bieten auch die Gelegenheit, {\"u}ber Kommunikation nachzudenken. Protokolle, Kodierungen, Spezifizierungen sind Beitr{\"a}ge der Informatik zur Wissensstrukturierung; Netzwerke und Datenbanken oder Kombinationen davon (also zum Beispiel das Internet) dienen der Kommunikation dieser Strukturen {\"u}ber kurze und weite Strecken, aber auch {\"u}ber die Dimension der Zeit hinweg. Im Schulunterricht sind genau solche F{\"a}higkeiten gefragt; Grup- pen- oder Projektarbeit oder auch Lerntageb{\"u}cher sind schon l{\"a}nger wirksame Mittel zum „besseren`` Lehren und Lernen. Im Mathematikunterricht, speziell in der Geometrie, k{\"o}nnen nun neue Medien, in diesem Fall Lehr-/Lernsoftware, mit den infor- mationstechnischen Methoden verkn{\"u}pft werden; in diesem Arti- kel versuchen wir allgemeine Richtlinien herzuleiten und stellen kurz einige durch diese Richtlinien motivierten Projekte vor.}, Address = {Hildesheim}, Author = {Kortenkamp, Ulrich}, Booktitle = {Strukturieren -- Modellieren -- Kommunizieren. Leitbilder mathematischer und informatischer Aktivit{\"a}ten}, Date-Added = {2007-07-03 15:30:29 +0200}, Date-Modified = {2011-10-21 08:32:37 +0000}, Editor = {Engel, Joachim and Vogel, Rose and Wessolowski, Silvia}, Keywords = {invited}, Language = {german}, Pages = {141-150}, Publisher = {Franzbecker}, Title = {Dokumentation, {D}iskussion und {P}rotokolle: {W}ie kommuniziert man {G}eometrie im {I}nternetzeitalter?}, Type = {{Festschrift f{\"u}r Karl-Dieter Klose, Siegfried Krauter, Herbert L{\"o}the und Heinrich W{\"o}lpert.}}, Url = {http://kortenkamps.net/papers/2005/DDP-LB.pdf}, Year = {2005}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://kortenkamps.net/papers/2005/DDP-LB.pdf}}

@inproceedings{SpaKor-CWFUK-2007, Address = {Hildesheim}, Author = {Spannagel, Christian and Kortenkamp, Ulrich}, Booktitle = {Beitr{\"a}ge zum Mathematikunterricht. Vortr{\"a}ge auf der 41. Tagung f{\"u}r Didaktik der Mathematik in Berlin}, Date-Added = {2007-07-03 15:27:15 +0200}, Date-Modified = {2014-09-15 10:15:38 +0000}, Keywords = {invited; process assessment}, Publisher = {Franzbecker}, Title = {CleverPHL -- ein Werkzeug zum flexiblen Umgang mit Konstruktionsprozessen in DGS}, Url = {http://www.mathematik.tu-dortmund.de/ieem/cms/media/BzMU/BzMU2007/Spannagel_%20Kortenkamp.pdf}, Year = {2007}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://www.mathematik.tu-dortmund.de/ieem/cms/media/BzMU/BzMU2007/Spannagel_%20Kortenkamp.pdf}}

@book{RicKor-CJE-2003, Address = {Tokyo}, Author = {Richter-Gebert, J{\"u}rgen and Kortenkamp, Ulrich H.}, Date-Added = {2007-07-03 15:02:43 +0200}, Date-Modified = {2011-10-21 08:42:40 +0000}, Keywords = {software}, Publisher = {Springer-Verlag}, Title = {\japanese{シンデレラ. 幾何学のためのグラフィックス}}, Year = {2003}}

@incollection{Kor-CTAT-2007, Abstract = {This article discusses some ways to combine software for interactive geometry and computer algebra, with an emphasis on using this software in teaching. Some arising mathematical problems and necessary software specific paradigms that have to be adjusted are considered, and solutions to these problems are presented. The article also highlights some of the aspects that drove the development of the mathematics software Cinderella.2, which integrates an interactive geometry software package, a physics simulation engine, and an all-purpose functional programming language.}, Address = {Singapore}, Author = {Kortenkamp, Ulrich}, Booktitle = {Symbolic Computation and Education}, Date-Added = {2007-07-03 13:34:54 +0200}, Date-Modified = {2012-01-08 16:13:02 +0000}, Editor = {Li, Shangzhi and Wang, Dongming and Zhang, Jing-Zhong}, Keywords = {refereed}, Pages = {150-173}, Publisher = {World Scientific}, Title = {Combining {CAS} and {DGS} -- {T}owards {A}lgorithmic {T}hinking}, Year = {2007}, Bdsk-File-1 = {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}}

@article{Kor-AGU-2006, Address = {Hannover}, Author = {Kortenkamp, Ulrich}, Date-Added = {2007-02-22 13:25:57 +0100}, Date-Modified = {2011-01-28 10:02:13 +0100}, Journal = {Der Mathematikunterricht}, Keywords = {refereed}, Number = {1}, Pages = {32-39}, Publisher = {Friedrich Verlag}, Title = {Algorithmische {G}eometrie im {U}nterricht}, Volume = {52}, Year = {2006}}

@inproceedings{MulBesKorSpa-ICAMCSP-2006, Address = {{\AA}lesund}, Author = {M{\"u}ller, Wolfgang and Bescherer, Christine and Kortenkamp, Ulrich and Spannagel, Christian}, Booktitle = {Proceedings of the IFIP WG 3.1, 3.3, \& 3.5 Joint Conference Imagining the future for ICT and Education, {\AA}lesund, Norway}, Date-Added = {2006-11-30 00:41:44 +0100}, Date-Modified = {2014-09-15 10:15:23 +0000}, Keywords = {refereed; process assessment}, Publisher = {IFIP}, Title = {Intelligent Computer-aided Assessment in the Math Classroom: State-of-the-art and Perspectives}, Year = {2006}, Bdsk-File-1 = {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}}

@online{Kor-PA-2006, Author = {Kortenkamp, Ulrich}, Date-Added = {2006-11-30 00:38:12 +0100}, Date-Modified = {2011-01-28 10:02:14 +0100}, Keywords = {lehrer}, Note = {Beitrag auf Lehrer-Online}, Read = {No}, Title = {{P}unkt- und {A}chsenspiegelungen}, Url = {http://www.lehrer-online.de/url/spiegelungen}, Year = {2006}, Bdsk-File-1 = {YnBsaXN0MDDUAQIDBAUGJCVYJHZlcnNpb25YJG9iamVjdHNZJGFyY2hpdmVyVCR0b3ASAAGGoKgHCBMUFRYaIVUkbnVsbNMJCgsMDxJXTlMua2V5c1pOUy5vYmplY3RzViRjbGFzc6INDoACgAOiEBGABIAFgAdccmVsYXRpdmVQYXRoWWFsaWFzRGF0YV8QIFBhcGVycy9Lb3J0ZW5rYW1wLUxPLVBBLTIwMDYucGRm0hcLGBlXTlMuZGF0YU8RAewAAAAAAewAAgAADE1hY2ludG9zaCBIRAAAAAAAAAAAAAAAAAAAAAAAAABCRAAB/////xlLb3J0ZW5rYW1wLUxPLVBBLTIwMDYucGRmAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAD/////AAAAAAAAAAQAAAG1AAEAAwAACiBjdQAAAAAAAAAAAAAAAAAGUGFwZXJzAAIAby86VXNlcnM6dWxsaTpDbG91ZHN0YXRpb246Q2xvdWRzdGF0aW9uIFVQOkVpZ2VuZSBQYXBlcnM6UHVibGlrYXRpb25lbiB2b24gVWxsaTpQYXBlcnM6S29ydGVua2FtcC1MTy1QQS0yMDA2LnBkZgAADgA0ABkASwBvAHIAdABlAG4AawBhAG0AcAAtAEwATwAtAFAAQQAtADIAMAAwADYALgBwAGQAZgAPABoADABNAGEAYwBpAG4AdABvAHMAaAAgAEgARAASAG1Vc2Vycy91bGxpL0Nsb3Vkc3RhdGlvbi9DbG91ZHN0YXRpb24gVVAvRWlnZW5lIFBhcGVycy9QdWJsaWthdGlvbmVuIHZvbiBVbGxpL1BhcGVycy9Lb3J0ZW5rYW1wLUxPLVBBLTIwMDYucGRmAAATAAEvAAAVAAIAC///AACABtIbHB0eWiRjbGFzc25hbWVYJGNsYXNzZXNdTlNNdXRhYmxlRGF0YaMdHyBWTlNEYXRhWE5TT2JqZWN00hscIiNcTlNEaWN0aW9uYXJ5oiIgXxAPTlNLZXllZEFyY2hpdmVy0SYnVHJvb3SAAQAIABEAGgAjAC0AMgA3AEAARgBNAFUAYABnAGoAbABuAHEAcwB1AHcAhACOALEAtgC+Aq4CsAK1AsACyQLXAtsC4gLrAvAC/QMAAxIDFQMaAAAAAAAAAgEAAAAAAAAAKAAAAAAAAAAAAAAAAAAAAxw=}, Bdsk-Url-1 = {http://www.lehrer-online.de/url/spiegelungen}}

@thesis{Hun-POM-1995, Address = {M{\"u}nster}, Author = {Hund, Ulrich}, Date-Added = {2006-11-30 00:34:35 +0100}, Date-Modified = {2011-01-28 10:02:13 +0100}, Institution = {Westf{\"a}lische Wilhelms-Universit{\"a}t}, Keywords = {qualifikation}, Language = {german}, Month = mar, Read = {Yes}, Title = {Pseudosph{\"a}renarrangements zu {O}rientierten {M}atroiden}, Type = {Diplomarbeit}, Workarea = Combinatorics, Year = 1995}

@inproceedings{KorRic-GEI-1998, Abstract = {Interactive Geometry is a major tool in modern geometry education and various software tools are available. We discuss the requirements of such tools and how they can be fulfilled. We also explain how a geometry tool can benefit from the Internet and present Cinderella's Caf{\'e}, which is an internet-aware geometry tool with a high mathematical background.}, Address = {Charlottesville}, Author = {Kortenkamp, Ulrich H. and Richter-Gebert, J{\"u}rgen}, Booktitle = {Ed-Media \& Ed-Telecom 98. Proceedings of the Tenth World Conference on Educational Multimedia and Hypermedia \& World Conference on Educational Telecommunications, Freiburg, Germany, June 20-25, 1998}, Date-Added = {2006-11-30 00:34:35 +0100}, Date-Modified = {2011-01-28 10:02:14 +0100}, Editor = {Ottmann, Thomas and Tomek, Ivan}, Keywords = {refereed}, Publisher = {AACE}, Title = {Geometry and education in the {I}nternet age}, Url = {http://www.cinderella.de/papers/geo-i.pdf.gz}, Workarea = Education, Year = 1998, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://www.cinderella.de/papers/geo-i.pdf.gz}}

@article{Kor-GLI-1999, Author = {Kortenkamp, Ulli}, Date-Added = {2006-11-30 00:34:35 +0100}, Date-Modified = {2011-01-28 10:02:13 +0100}, Journal = {Interface}, Keywords = {lehrer}, Pages = {26--29}, Publisher = {SFIB}, Title = {Geometrie lehren mit dem {Internet}}, Volume = 2, Year = 1999}

@incollection{KorRic-C-1999, Address = {Heidelberg}, Author = {Kortenkamp, Ulrich H. and Richter-Gebert, J{\"u}rgen}, Booktitle = {Erfahrungen mit Java}, Chapter = 17, Date-Added = {2006-11-30 00:34:35 +0100}, Date-Modified = {2011-01-28 10:02:14 +0100}, Editor = {Maffeis, Silvano and Toenniessen, Fridtjof and Zeidler, Christian}, Keywords = {refereed}, Language = {german}, Pages = {381--401}, Publisher = {dpunkt.verlag}, Title = {Das {C}inderella-{P}rojekt}, Url = {http://www.amazon.de/exec/obidos/ASIN/3932588339/theinteractive07}, Year = 1999, Bdsk-Url-1 = {http://www.amazon.de/exec/obidos/ASIN/3932588339/theinteractive07}}

@inproceedings{RicKor-DGPC-1999, Author = {Richter-Gebert, J{\"u}rgen and Kortenkamp, Ulrich H.}, Booktitle = {Abstracts 15th European Workshop Comput. Geom.}, Date-Added = {2006-11-30 00:34:35 +0100}, Date-Modified = {2011-01-28 10:02:14 +0100}, Keywords = {refereed}, Nickname = {CG '99}, Pages = {51--53}, Publisher = {INRIA Sophia-Antipolis}, Site = {Antibes}, Title = {Dynamic Geometry {I}: The Problem of Continuity}, Url = {http://www.cinderella.de/papers/antibes-1.pdf}, Workarea = Geometry, Year = 1999, Bdsk-Url-1 = {http://www.cinderella.de/papers/antibes-1.pdf}}

@inproceedings{KorRic-DGA-1999, Author = {Kortenkamp, Ulrich H. and Richter-Gebert, J{\"u}rgen}, Booktitle = {Abstracts 15th European Workshop Comput. Geom.}, Date-Added = {2006-11-30 00:34:35 +0100}, Date-Modified = {2011-01-28 10:02:14 +0100}, Keywords = {refereed}, Nickname = {CG '99}, Pages = {109--111}, Publisher = {INRIA Sophia-Antipolis}, Site = {Antibes}, Title = {Dynamic Geometry {II}: Applications}, Url = {http://cinderella.de/papers/antibes-2.pdf}, Workarea = Geometry, Year = 1999, Bdsk-Url-1 = {http://cinderella.de/papers/antibes-2.pdf}}

@inproceedings{KorRic-ENGC-1999, Author = {Kortenkamp, Ulrich H. and Richter-Gebert, J{\"u}rgen}, Booktitle = {Tagungsband zum N{\"u}rnberger Kolloquium zur Didaktik der Mathematik 1999}, Date-Added = {2006-11-30 00:34:35 +0100}, Date-Modified = {2011-01-28 10:02:14 +0100}, Editor = {Weth, Thomas}, Keywords = {invited}, Language = {german}, Title = {Euklidische und {N}icht-{E}uklidische {G}eometrie mit {C}inderella}, Url = {http://www.inf.fu-berlin.de/~kortenka/Papers/nichtEuklidisch.pdf}, Workarea = Geometry, Year = 1999, Bdsk-File-1 = {YnBsaXN0MDDUAQIDBAUGJCVYJHZlcnNpb25YJG9iamVjdHNZJGFyY2hpdmVyVCR0b3ASAAGGoKgHCBMUFRYaIVUkbnVsbNMJCgsMDxJXTlMua2V5c1pOUy5vYmplY3RzViRjbGFzc6INDoACgAOiEBGABIAFgAdccmVsYXRpdmVQYXRoWWFsaWFzRGF0YV8QKlBhcGVycy9Lb3J0ZW5rYW1wUmljaHRlci1HZS1FTkdDLTE5OTlhLnBkZtIXCxgZV05TLmRhdGFPEQIUAAAAAAIUAAIAAAxNYWNpbnRvc2ggSEQAAAAAAAAAAAAAAAAAAAAAAAAAQkQAAf////8fS29ydGVua2FtcFJpY2h0ZXItI0ZGRkZGRkZGLnBkZgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA/////wAAAAAAAAAAAAAAAAABAAMAAAogY3UAAAAAAAAAAAAAAAAABlBhcGVycwACAHkvOlVzZXJzOnVsbGk6Q2xvdWRzdGF0aW9uOkNsb3Vkc3RhdGlvbiBVUDpFaWdlbmUgUGFwZXJzOlB1Ymxpa2F0aW9uZW4gdm9uIFVsbGk6UGFwZXJzOktvcnRlbmthbXBSaWNodGVyLUdlLUVOR0MtMTk5OWEucGRmAAAOAEgAIwBLAG8AcgB0AGUAbgBrAGEAbQBwAFIAaQBjAGgAdABlAHIALQBHAGUALQBFAE4ARwBDAC0AMQA5ADkAOQBhAC4AcABkAGYADwAaAAwATQBhAGMAaQBuAHQAbwBzAGgAIABIAEQAEgB3VXNlcnMvdWxsaS9DbG91ZHN0YXRpb24vQ2xvdWRzdGF0aW9uIFVQL0VpZ2VuZSBQYXBlcnMvUHVibGlrYXRpb25lbiB2b24gVWxsaS9QYXBlcnMvS29ydGVua2FtcFJpY2h0ZXItR2UtRU5HQy0xOTk5YS5wZGYAABMAAS8AABUAAgAL//8AAIAG0hscHR5aJGNsYXNzbmFtZVgkY2xhc3Nlc11OU011dGFibGVEYXRhox0fIFZOU0RhdGFYTlNPYmplY3TSGxwiI1xOU0RpY3Rpb25hcnmiIiBfEA9OU0tleWVkQXJjaGl2ZXLRJidUcm9vdIABAAgAEQAaACMALQAyADcAQABGAE0AVQBgAGcAagBsAG4AcQBzAHUAdwCEAI4AuwDAAMgC4ALiAucC8gL7AwkDDQMUAx0DIgMvAzIDRANHA0wAAAAAAAACAQAAAAAAAAAoAAAAAAAAAAAAAAAAAAADTg==}, Bdsk-Url-1 = {http://www.inf.fu-berlin.de/~kortenka/Papers/nichtEuklidisch.pdf}}

@unpublished{KorRic-SJE-1999, Author = {Kortenkamp, Ulrich H. and Richter-Gebert, J{\"u}rgen}, Date-Added = {2006-11-30 00:34:35 +0100}, Date-Modified = {2011-01-28 10:02:14 +0100}, Keywords = {sonstige}, Note = {Unpublished Manuscript}, Title = {Shrink-Wrapped Java in Education}, Url = {http://www.cinderella.de/papers/shrink.pdf}, Year = 1999, Bdsk-Url-1 = {http://www.cinderella.de/papers/shrink.pdf}}

@book{RicKor-IGSC-1999, Address = {Heidelberg}, Author = {Richter-Gebert, J{\"u}rgen and Kortenkamp, Ulrich H.}, Date-Added = {2006-11-30 00:34:35 +0100}, Date-Modified = {2011-01-28 10:02:14 +0100}, Keywords = {software}, Publisher = {Springer-Verlag}, Title = {The Interactive Geometry Software Cinderella}, Url = {http://cinderella.de}, Workarea = Geometry, Year = {1999}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://cinderella.de}}

@article{Kor-FDG-2000, Author = {Kortenkamp, Ulrich}, Date-Added = {2006-11-30 00:34:35 +0100}, Date-Modified = {2011-01-28 10:02:13 +0100}, Journal = {Journal f{\"u}r Mathematikdidaktik}, Keywords = {sonstige}, Number = 2, Pages = {161--162}, Title = {Foundations of {D}ynamic {G}eometry}, Volume = 21, Workarea = Geometry, Year = 2000}

@inproceedings{KorRic-DCDG-2000, Abstract = {Geometric straight-line programs [6, 10] can be used to model geo- metric constructions and their implicit ambiguities. In this paper we discuss the complexity of deciding whether two instances of the same geometric straight-line program are connected by a continuous path, the Complex Reachability Problem.}, Author = {Kortenkamp, Ulrich and Richter-Gebert, J{\"u}rgen}, Booktitle = {Proceedings of ADG 2000}, Date-Added = {2006-11-30 00:34:35 +0100}, Date-Modified = {2011-01-28 10:02:14 +0100}, Editor = {Wang, Dongming}, Keywords = {refereed}, Note = {Extended Abstract}, Pages = {216--220}, Series = {International Workshop on Automatic Deduction in Geometry}, Title = {Decision complexity in {D}ynamic {G}eometry}, Url = {http://kortenkamps.net/papers/2000/ADG2000_UK.pdf}, Volume = 3, Workarea = Geometry, Year = 2000, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://kortenkamps.net/papers/2000/ADG2000_UK.pdf}}

@article{Kor-ISFL2-2000, Author = {Kortenkamp, Ulrich}, Date-Added = {2006-11-30 00:34:35 +0100}, Date-Modified = {2011-01-28 10:02:13 +0100}, Journal = {FU-Nachrichten}, Keywords = {sonstige}, Month = jun, Read = {Yes}, Title = {Internetf{\"a}hige {S}oftware f{\"u}rs {L}ernen im 21.~{J}ahrhundert}, Url = {http://www.fu-berlin.de/fun/6-00/wissenschaft/wissenschaft4.html}, Volume = 6, Year = 2000, Bdsk-Url-1 = {http://www.fu-berlin.de/fun/6-00/wissenschaft/wissenschaft4.html}}

@article{RicH.K-CNU-2000, Author = {Richter-Gebert, J{\"u}rgen and H.~Kortenkamp, Ulrich}, Date-Added = {2006-11-30 00:34:35 +0100}, Date-Modified = {2011-01-28 10:02:14 +0100}, Journal = {Rundgang}, Keywords = {lehrer}, Month = jun, Place = {Zug}, Publisher = {Klett und Balmer}, Title = {Cinderella -- {N}achmittagssoftware im {U}nterricht?}, Url = {http://www.cinderella.de/papers/rundgang0200.pdf}, Volume = 2, Workarea = Education, Year = 2000, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://www.cinderella.de/papers/rundgang0200.pdf}}

@book{RicH.K-IGC-2000, Address = {Heidelberg}, Author = {Richter-Gebert, J{\"u}rgen and H.~Kortenkamp, Ulrich}, Date-Added = {2006-11-30 00:34:35 +0100}, Date-Modified = {2011-01-28 10:02:14 +0100}, Keywords = {software}, Month = dec, Note = {German translation}, Publisher = {Springer-Verlag}, Title = {Die interaktive {G}eometry-{S}oftware {C}inderella}, Workarea = Geometry, Year = {2000}, Bdsk-File-1 = {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}}

@article{Kor-DG-2001, Author = {Kortenkamp, Ulrich}, Date-Added = {2006-11-30 00:34:35 +0100}, Date-Modified = {2011-01-28 10:02:13 +0100}, Journal = {Mitteilungen der DMV}, Keywords = {invited}, Language = {german}, Pages = {33--40}, Title = {Dynamische {G}eometrie}, Volume = 3, Year = 2001}

@book{RicKor-CPIG-2001, Address = {Lisbon}, Author = {Richter-Gebert, J{\"u}rgen and Kortenkamp, Ulrich H.}, Date-Added = {2006-11-30 00:34:35 +0100}, Date-Modified = {2011-01-28 10:02:14 +0100}, Keywords = {software}, Note = {Portuguese translation.}, Publisher = {CMAFUL}, Title = {Cinderella -- Programa interactivo di Geometria}, Url = {http://cinderella.lmc.fc.ul.pt}, Year = 2001, Bdsk-Url-1 = {http://cinderella.lmc.fc.ul.pt}}

@book{RicH.K-CSIG-2001, Address = {Mailand}, Author = {Richter-Gebert, J{\"u}rgen and H.~Kortenkamp, Ulrich}, Date-Added = {2006-11-30 00:34:35 +0100}, Date-Modified = {2011-01-28 10:02:14 +0100}, Keywords = {software}, Note = {Italian translation.}, Publisher = {Springer-Verlag}, Title = {Cinderella -- {S}oftware interattivo di geometria}, Workarea = Geometry, Year = 2001}

@inproceedings{Kor-IGC-2001, Address = {Karlsruhe}, Author = {Kortenkamp, Ulrich}, Booktitle = {Tagungsband Learntec 2001}, Date-Added = {2006-11-30 00:34:35 +0100}, Date-Modified = {2011-01-28 10:02:13 +0100}, Editor = {Beck, Uwe and Sommer, Winfried}, Keywords = {refereed}, Language = {german}, Month = oct, Pages = {525--532}, Title = {Die interaktive {G}eometrie-{S}oftware {C}inderella}, Volume = 2, Workarea = Education, Year = 2001}

@inproceedings{RicKor-CIDG-2002, Abstract = {This article deals with the intrinsic complexity of tracing and reachability questions in the context of elementary geometric constructions. We consider constructions from elementary geometry as dynamic entities: while the free points of a construction perform a continuous motion the dependent points should move consistently and contin- uously. We focus on constructions that are entirely built up from join, meet and angular bisector operations. In particular the last operation introduces an intrinsic ambiguity: Two intersecting lines have two different angular bisectors. Under the requirement of continuity it is a fundamental algorithmic problem to resolve this ambiguity properly during motions of the free elements. After formalizing this intuitive setup we prove the following main results of this article: It is NP-hard to trace the dependent elements in such a construction. It is NP-hard to decide whether two instances of the same construction lie in the same component of the configuration space. The last problem becomes PSPACE-hard if we allow one additional sidedness test which has to be satisfied during the entire motion. On the one hand the results have practical relevance for the implementations of Dy- namic Geometry Systems. On the other hand the results can be interpreted as statements concerning the intrinsic complexity of analytic continuation.}, Author = {Richter-Gebert, J{\"u}rgen and Kortenkamp, Ulrich H.}, Booktitle = {Foundations of Computational Mathematics (Proceedings of the Smale Fest 2000)}, Date-Added = {2006-11-30 00:34:35 +0100}, Date-Modified = {2011-01-28 10:02:14 +0100}, Editor = {Cucker, Felipe and Rojas, J. Maurice}, Keywords = {refereed}, Note = {Also available as technical report TRB-2000/22, Freie Universit{\"a}t Berlin}, Publisher = {World Scientific}, Read = {Yes}, Title = {Complexity issues in {D}ynamic {G}eometry}, Year = 2002, Bdsk-File-1 = {YnBsaXN0MDDUAQIDBAUGJCVYJHZlcnNpb25YJG9iamVjdHNZJGFyY2hpdmVyVCR0b3ASAAGGoKgHCBMUFRYaIVUkbnVsbNMJCgsMDxJXTlMua2V5c1pOUy5vYmplY3RzViRjbGFzc6INDoACgAOiEBGABIAFgAdccmVsYXRpdmVQYXRoWWFsaWFzRGF0YV8QKlBhcGVycy9SaWNodGVyLUdlS29ydGVua2FtcC1DSURHLTIwMDJhLnBkZtIXCxgZV05TLmRhdGFPEQIUAAAAAAIUAAIAAAxNYWNpbnRvc2ggSEQAAAAAAAAAAAAAAAAAAAAAAAAAQkQAAf////8fUmljaHRlci1HZUtvcnRlbmthI0ZGRkZGRkZGLnBkZgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA/////wAAAAAAAAAAAAAAAAABAAMAAAogY3UAAAAAAAAAAAAAAAAABlBhcGVycwACAHkvOlVzZXJzOnVsbGk6Q2xvdWRzdGF0aW9uOkNsb3Vkc3RhdGlvbiBVUDpFaWdlbmUgUGFwZXJzOlB1Ymxpa2F0aW9uZW4gdm9uIFVsbGk6UGFwZXJzOlJpY2h0ZXItR2VLb3J0ZW5rYW1wLUNJREctMjAwMmEucGRmAAAOAEgAIwBSAGkAYwBoAHQAZQByAC0ARwBlAEsAbwByAHQAZQBuAGsAYQBtAHAALQBDAEkARABHAC0AMgAwADAAMgBhAC4AcABkAGYADwAaAAwATQBhAGMAaQBuAHQAbwBzAGgAIABIAEQAEgB3VXNlcnMvdWxsaS9DbG91ZHN0YXRpb24vQ2xvdWRzdGF0aW9uIFVQL0VpZ2VuZSBQYXBlcnMvUHVibGlrYXRpb25lbiB2b24gVWxsaS9QYXBlcnMvUmljaHRlci1HZUtvcnRlbmthbXAtQ0lERy0yMDAyYS5wZGYAABMAAS8AABUAAgAL//8AAIAG0hscHR5aJGNsYXNzbmFtZVgkY2xhc3Nlc11OU011dGFibGVEYXRhox0fIFZOU0RhdGFYTlNPYmplY3TSGxwiI1xOU0RpY3Rpb25hcnmiIiBfEA9OU0tleWVkQXJjaGl2ZXLRJidUcm9vdIABAAgAEQAaACMALQAyADcAQABGAE0AVQBgAGcAagBsAG4AcQBzAHUAdwCEAI4AuwDAAMgC4ALiAucC8gL7AwkDDQMUAx0DIgMvAzIDRANHA0wAAAAAAAACAQAAAAAAAAAoAAAAAAAAAAAAAAAAAAADTg==}}

@article{Kor-KPG-2002, Address = {Velber}, Author = {Kortenkamp, Ulrich}, Date-Added = {2006-11-30 00:34:35 +0100}, Date-Modified = {2011-01-28 10:02:13 +0100}, Journal = {mathematik lehren}, Keywords = {lehrer}, Language = {german}, Month = jun, Pages = {16--20}, Publisher = {Friedrich Verlag}, Title = {Kegelschnitte und {P}rojektive {G}eometrie}, Volume = 112, Year = 2002}

@misc{RicKor-KJ2-2002, Author = {Richter-Gebert, J{\"u}rgen and Kortenkamp, Ulrich}, Date-Added = {2006-11-30 00:34:35 +0100}, Date-Modified = {2011-01-28 10:02:14 +0100}, Keywords = {sonstige}, Note = {MathInsight 2000, Springer-Verlag, Heidelberg.}, Publisher = {Springer-Verlag}, Title = {Kalenderblatt {Juni} 2002}, Year = {2002}}

@inproceedings{Kor-GUCCME-2005, Abstract = {Computers are the ultimate tool for teaching: They provide mi- croworlds that can be explored; they can be forgiving and strict; they take ac- count of everything that's happening; they can create maps of what the learner knows or still has to learn; they are fun to use; they provide interactive illustra- tions that enlighten those who use them --- or at least, that's what they could be or do. There are significant drawbacks: many people do not know what they could do with them; if they know it, they probably do not know how to make them do it; and, finally, it is not validated whether it is of any didactic value to use them in the way they are used. In this text, we present some basic guidelines that can help in designing and evaluating electronic material. Starting from an example, we identify some roles the computer can take and discuss their implications for the development of mathematics tools.}, Address = {Daejon}, Author = {Kortenkamp, Ulrich}, Booktitle = {Proceedings of the 1st KAIST Symposium on Enhancing University Mathematics Teaching}, Date-Added = {2006-11-28 17:00:12 +0100}, Date-Modified = {2011-01-28 10:02:13 +0100}, Editor = {Arganbright, Deane}, Keywords = {invited}, Publisher = {KAIST}, Title = {Guidelines for Using Computers Creatively in Mathematics Education}, Url = {http://kortenkamps.net/papers/2005/KAIST.pdf}, Year = {2005}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://kortenkamps.net/papers/2005/KAIST.pdf}}

@article{GesKorLutMat-VVADM-2005, Abstract = { Abstract: Which route should the garbage collectors' truck take? Just a simple question, but also the starting point of an exciting mathematics class. The only ``hardware you need is a city map, given on a sheet of paper or on the computer screen. Then lively discussions will take place in the classroom on how to find an optimal routing for the truck. The aim of this activity is to develop an algorithm that constructs Eulerian tours in graphs and to learn about graphs and their properties. This teaching sequence, and those stemming from discrete mathematics, in particular combinatorial optimization, are ideal for training problem solving skills and modeling -- general com- petencies that, influenced by the German National Standards, are finding their way into curricula. In this article, we investigate how computers can help in pro- viding individual teaching tools for students. Within the Visage project we focus on electronic activities that can enhance explo- rations with graphs and guide students even if the teacher is not available -- without taking away freedom and creativity. The software package is embedded into a standard DGS, and it offers many pre-built and teacher-customizable tools in the area of graph algorithms. Until now, there are no complete didactical concepts for teach- ing graph algorithms, in particular using new media. We see a huge potential in our methods, and the topic is highly requested on part of the teachers, as it introduces a modern and highly relevant part of mathematics into the curriculum. }, Author = {Geschke, Anne and Kortenkamp, Ulrich and Lutz-Westphal, Brigitte and Materlik, Dirk}, Date-Added = {2006-11-28 15:25:56 +0100}, Date-Modified = {2011-01-28 10:02:13 +0100}, Journal = {Zentralblatt f{\"u}r Didaktik der Mathematik}, Keywords = {refereed}, Language = {english}, Local-Url = {file://localhost/Users/ulli/Documents/Yep%20Documents/Local/docs/2006/10/ZDM-Visage-1.pdf}, Number = {5}, Pages = {395-401}, Title = {Visage -- Visualization of Algorithms in Discrete Mathematics}, Volume = {37}, Year = {2005}, Bdsk-File-1 = {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}}

@incollection{RicKor-GDG-2001, Abstract = {In this article we present fundamental definitions that can be used to introduce a mathe- matical model for dynamic geometry. Starting from reasonable expectations that such a model should meet we will formalize the terms (dynamic) construction, instance of a construction and Dynamic-Geometry-System (DGS). The behavior of a DGS will be described by the terms conservatism and continuity. One of the main results of this ar- ticle is that we can find a continuous DGS for any construction Z that is built up using algebraic basic construction steps only.}, Address = {Hildesheim, Berlin}, Author = {Richter-Gebert, J{\"u}rgen and Kortenkamp, Ulrich}, Booktitle = {{Z}eichnung -- {F}igur -- {Z}ugfigur}, Date-Added = {2006-11-21 17:48:59 +0100}, Date-Modified = {2011-01-28 10:02:14 +0100}, Editor = {Henn, Hans-Wolfgang and Elschenbroich, Hans-J{\"u}rgen and Gawlick, Thomas}, Keywords = {refereed}, Language = {german}, Pages = {123--144}, Publisher = {Franzbecker}, Title = {Grundlagen {D}ynamischer {G}eometrie}, Url = {http://kortenkamps.net/papers/2001/DG_OW1.pdf}, Year = {2001}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://kortenkamps.net/papers/2001/DG_OW1.pdf}}

@inproceedings{BreKor-ATGWIT-2004, Abstract = {In this article we will give a brief introduction into new ways of teaching that are possi- ble with interactive geometry software, in particular with Cinderella, which has just become available in Japan.}, Address = {Kyoto}, Author = {Brehm, Enno and Kortenkamp, Ulrich}, Booktitle = {Proceedings of RIMS-Workshop ITMga 2003}, Date-Modified = {2011-01-28 10:02:13 +0100}, Editor = {Nagaoka, Ryosuke and Ishi, Hideyuki and Hitzer, Eckhard}, Keywords = {invited}, Number = {1378}, Publisher = {RIMS}, Title = {Advanced {T}eaching of {G}eometry with {I}nteractive {T}ools}, Url = {http://repository.kulib.kyoto-u.ac.jp/dspace/bitstream/2433/25650/1/1378-9.pdf}, Year = {2004}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://repository.kulib.kyoto-u.ac.jp/dspace/bitstream/2433/25650/1/1378-9.pdf}}

@inproceedings{Kor-MMTNVC-2002, Abstract = {Cinderella is a software package for interactive or dynamic geometry. Its first version was published in 1999 and was the first geometry software to be based on the theory of complex tracing3, thus avoiding mathematical inconsistencies and unmotivated discontinuities (modulo numerical errors). At the ICMS 2002 we will introduce the next major version of Cinderella and highlight its new features and new concepts.}, Author = {Kortenkamp, Ulrich}, Booktitle = {Proceedings of the First International Congress of Mathematical Software}, Date-Modified = {2011-01-28 10:02:13 +0100}, Editor = {Cohen, Arjeh M. and Gao, Xiao-Shan and Takayama, Nobuki}, Keywords = {refereed}, Note = {A slightly modified version appeared in the proceedings of CCCG 02.}, Owner = {kortenka}, Pages = {208--216}, Pdf = {Kortenkamp2002a.pdf}, Publisher = {World Scientific}, Title = {Making the move: {T}he next version of {C}inderella}, Url = {http://www.cs.uleth.ca/~wismath/cccg/papers/ulrich.pdf}, Year = {2002}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://www.cs.uleth.ca/~wismath/cccg/papers/ulrich.pdf}}

@inproceedings{Kor-KSA-2005, Address = {Hildesheim}, Author = {Kortenkamp, Ulrich}, Booktitle = {Beitr{\"a}ge zum Mathematikunterricht. Vortr{\"a}ge auf der 39. Tagung f{\"u}r Didaktik der Mathematik in Bielefeld}, Date-Modified = {2014-03-24 07:28:56 +0000}, Editor = {G{\"u}nter Graumann}, Keywords = {invited}, Location = {Heidelberg}, Organization = {Gesellschaft f{\"u}r Didaktik der Mathematik}, Publisher = {Franzbecker}, Title = {Klammergebirge als {S}trukturierungshilfe in der {A}lgebra}, Url = {http://www.mathematik.tu-dortmund.de/ieem/cms/media/BzMU/BzMU2005/Beitraege/kortenkamp1-gdm05.pdf}, Year = {2005}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://www.mathematik.tu-dortmund.de/ieem/cms/media/BzMU/BzMU2005/Beitraege/kortenkamp1-gdm05.pdf}}

@inproceedings{Kor-VVG-2005, Address = {Bielefeld}, Author = {Kortenkamp, Ulrich}, Booktitle = {Beitr{\"a}ge zum Mathematikunterricht. Vortr{\"a}ge auf der 39. Tagung f{\"u}r Didaktik der Mathematik}, Date-Modified = {2011-01-28 10:02:14 +0100}, Keywords = {invited}, Organization = {Gesellschaft f{\"u}r Didaktik der Mathematik}, Publisher = {Franzbecker}, Title = {Visage -- {V}isualisierung von {G}raphenalgorithmen}, Url = {http://www.mathematik.tu-dortmund.de/ieem/cms/media/BzMU/BzMU2005/Beitraege/kortenkamp2-gdm05.pdf}, Year = {2005}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://www.mathematik.tu-dortmund.de/ieem/cms/media/BzMU/BzMU2005/Beitraege/kortenkamp2-gdm05.pdf}}

@article{Kor-EMPWSMK-2004, Abstract = {Experimental mathematics is a serious branch of mathematics that starts gaining attention both in mathematics education and research. We give examples of using experimental techniques (not only) in the classroom. At first sight it seems that introducing experiments will weaken the formal rules and the abstractness of mathematics that are considered a valuable contribution to education as a whole. By putting proof and experiment side by side we show how this can be avoided. We also highlight consequences of experimentation for educational computer software.

Experimentelle Mathematik hat sich zu einem ernst zu nehmenden Teil der mathematischen Forschung und Ausbildung entwickelt, der immer mehr Beachtung findet. Wir geben Beispiele, wie solche experimentellen Techniken nicht nur, aber auch im Unterricht eingesetzt werden k{\"o}nnen. Zun{\"a}chst scheint es so, als w{\"u}rden Experimente die formalen Regeln und Abstraktionen der Mathematik schw{\"a}chen, die ein eigentliches Ziel des Mathematikunterrichts darstellen. Im Vergleich von Beweis und Experiment stellen wir dar, wie diese Schw{\"a}chung vermieden werden kann. Weiterhin betonen wir die Auswirkungen dieser Methoden auf Lern- und Lehrsoftware.}, Author = {Kortenkamp, Ulrich}, Date-Modified = {2011-01-28 10:02:13 +0100}, Journal = {Zentralblatt f{\"u}r Didaktik der Mathematik}, Keywords = {refereed}, Language = {english}, Month = apr, Number = {2}, Owner = {kortenka}, Pages = {61--66}, Pdf = {Kortenkamp2004a.pdf}, Title = {Experimental mathematics and proofs -- what is secure mathematical knowledge?}, Url = {http://subs.emis.de/journals/ZDM/zdm042a4.pdf}, Volume = {36}, Year = {2004}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://subs.emis.de/journals/ZDM/zdm042a4.pdf}}

@inproceedings{Kor-KDG-2004, Address = {Hildesheim}, Author = {Kortenkamp, Ulrich}, Booktitle = {Beitr{\"a}ge zum Mathematikunterricht. Vortr{\"a}ge auf der 38. Tagung f{\"u}r Didaktik der Mathematik in Augsburg}, Date-Modified = {2011-01-28 10:02:13 +0100}, Keywords = {invited}, Language = {german}, Organization = {Gesellschaft f{\"u}r Didaktik der Mathematik}, Owner = {kortenka}, Pdf = {Kortenkamp2004d.pdf}, Publisher = {Franzbecker}, Title = {Kommunizieren und {D}okumentieren von {G}eometrie}, Url = {http://kortenkamps.net/papers/2004/KommDokGeometrie.pdf}, Year = {2004}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://kortenkamps.net/papers/2004/KommDokGeometrie.pdf}}

@inproceedings{Kor-FMS-2001, Author = {Kortenkamp, Ulrich}, Booktitle = {Proceedings of MTCM 2000}, Date-Modified = {2011-01-28 10:02:13 +0100}, Keywords = {refereed}, Owner = {kortenka}, Pdf = {Kortenkamp2001.pdf}, Publisher = {Springer-Verlag}, Title = {The future of mathematical software}, Url = {http://kortenkamps.net/papers/2001/future.pdf}, Year = {2001}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://kortenkamps.net/papers/2001/future.pdf}}

@inproceedings{Kor-KDG-2000, Address = {Hildesheim}, Author = {Kortenkamp, Ulrich}, Booktitle = {Beitr{\"a}ge zum Mathematikunterricht. Vortr{\"a}ge auf der 35. Tagung f{\"u}r Didaktik der Mathematik in Potsdam}, Date-Modified = {2011-01-28 10:02:13 +0100}, Keywords = {invited}, Organization = {Gesellschaft f{\"u}r Didaktik der Mathematik}, Pages = {358--361}, Publisher = {Franzbecker}, Title = {Kontinuit{\"a}t in {D}ynamischer {G}eometrie}, Year = {2000}, Bdsk-File-1 = {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}}

@phdthesis{Kor-FDG-1999, Address = {Z{\"u}rich}, Author = {Kortenkamp, Ulrich}, Date-Modified = {2011-01-28 10:02:13 +0100}, Keywords = {qualifikation}, Language = {english}, Month = {11}, Read = {Yes}, School = {ETH Z{\"u}rich, Institut f{\"u}r Theoretische Informatik}, Title = {Foundations of {D}ynamic {G}eometry}, Type = {Dissertation}, Url = {http://kortenkamps.net/papers/1999/diss.pdf}, Workarea = {Dynamic Geometry}, Year = {1999}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://kortenkamps.net/papers/1999/diss.pdf}}

@article{Kor-ESPWMVQNP-1997, Abstract = {We show that every simplicial d-polytope with d + 4 vertices is a quotient of a neighborly (2d + 4)-polytope with 2d + 8 vertices, using the technique of affine Gale diagrams. The result is extended to matroid polytopes.}, Author = {Kortenkamp, Ulrich}, Date-Modified = {2011-01-28 10:02:13 +0100}, Journal = {Discrete \& Computational Geometry}, Keywords = {refereed}, Pages = {455--462}, Title = {Every simplicial polytope with at most $d+4$ vertices is a quotient of a neighborly polytope}, Url = {http://link.springer.de/link/service/journals/00454/htabst/18n4p455.html}, Volume = {18}, Year = {1997}, Bdsk-Url-1 = {http://link.springer.de/link/service/journals/00454/htabst/18n4p455.html}}

@inproceedings{KorMat-VLLM-2004, Author = {Kortenkamp, Ulrich and Materlik, Dirk}, Booktitle = {Grundfragen multimedialen Lehrens und Lernens. Tagungsband des 2. Workshops GML2004}, Date-Modified = {2011-01-28 10:02:14 +0100}, Editor = {Fellbaum, Klaus and Rebensburg, Klaus and Schwill, Andreas}, Keywords = {refereed}, Language = {german}, Owner = {kortenka}, Publisher = {Alcatel SEL}, Title = {Vernetztes Lehren und Lernen im Mathematikunterricht}, Year = {2004}}

@inproceedings{KorMat-PIGC-2004, __Markedentry = {0}, Abstract = {Pen-based input is the classical approach to drawing. Without computers, using a pen was the natural approach to do drawings, and the simplicity of this ``device always called for similar electronic solutions. Today, a broad range of electronic input devices is available that try to pair the simplicity of input with the power of computing. They come in all sizes: from small touch-screens with stylus in personal digital assistants, via desktop-size input tablets or interactive displays, to electronic whiteboards with rear- or front-projection. These devices all share a direct interaction paradigm. The challenge in using these devices for geometric constructions is to automatically annotate the drawn objects with their relations to the other objects. A basic example is the drawing of a right-angled triangle: How can we automatically recognize the user's intention to have a right angle? Can we do that at all? Do we really want to do that? If not -- what is the easiest pen-compatible way to have the user add this information? We will demonstrate several approaches to these problems, implemented in a development version of Cinderella. Another interesting issue is the presentation of hand-drawn figures: Is it possible to preserve the look of a sketch while still guaranteeing mathematically correct figures? Using the additional information gathered by automatic theorem proving we show some solutions.}, Author = {Kortenkamp, Ulrich and Materlik, Dirk}, Booktitle = {Proceedings of MathUI 2004}, Date-Modified = {2011-01-28 10:02:14 +0100}, Editor = {Libbrecht, Paul}, Keywords = {refereed}, Language = {english}, Owner = {kortenka}, Pdf = {Kortenkamp2004c.pdf}, Title = {Pen-based input of geometric constructions}, Url = {http://kortenkamps.net/papers/2004/Scribbling-article.pdf}, Year = {2004}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://kortenkamps.net/papers/2004/Scribbling-article.pdf}}

@article{KorMat-GTWCEUJJ-2004, Abstract = {Interactive geometry software is established as an important tool in geometry and math education. We present our research on possible ways to use such software in wireless classroom environments. In particular, we address user interface issues on portable devices and describe how we maintain a common code base for both desktop and mobile environments, thus increasing the stability of the application. We also report on our empirical data comparing different Java virtual machines that are available for portable devices using a prototype implementation of the Interactive Geometry Software Cinderella for J2ME. }, Author = {Kortenkamp, Ulrich and Materlik, Dirk}, Date-Modified = {2011-01-28 10:02:14 +0100}, Doi = {10.1016/j.scico.2004.02.006}, Journal = {Science of Computer Programming}, Keywords = {refereed}, Month = {10}, Number = {1}, Owner = {kortenka}, Pages = {71--85}, Pdf = {Kortenkamp2004.pdf}, Title = {Geometry teaching in wireless classroom environments using {Java} and {J2ME}}, Url = {http://kortenkamps.net/papers/2004/wirelessj2me-final.pdf}, Volume = {53}, Year = {2004}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://kortenkamps.net/papers/2004/wirelessj2me-final.pdf}, Bdsk-Url-2 = {http://dx.doi.org/10.1016/j.scico.2004.02.006}}

@inproceedings{KorRic-UATPIUGS-2004, Abstract = {Dynamic or interactive Geometry software (DGS) is the mathematical version of vector based draw- ing software: the objects (points, lines, circles, conics, polygons, etc.) are both graphical and mathematical enti- ties. This allows adding relations between the objects that govern their behavior. Thus, DGS is used as an input tool for constructions, as opposed to simple drawings. The additional information that is present in a construction can be used to greatly enhance the usability of DGS. We show how automatic theorem proving can be used to

  • remove redundant elements in a construction that obstruct a smooth work flow * clarify the semantics of user actions, and * improve the graphical rendering of elements. Finally we discuss the various possibilities of transforming the mathematical tool DGS into an educational

tool. Here, automatic theorem proving is used to analyze user actions and to react properly.}, Author = {Kortenkamp, Ulrich and Richter-Gebert, J{\"u}rgen}, Booktitle = {Proceedings of MathUI 2004}, Date-Modified = {2011-01-28 10:02:14 +0100}, Editor = {Libbrecht, Paul}, Keywords = {refereed}, Pdf = {Kortenkamp2004b.pdf}, Title = {Using Automatic Theorem Proving to Improve the Usability of Geometry Software}, Url = {http://kortenkamps.net/papers/2004/ATP-UI-article.pdf}, Year = {2004}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://kortenkamps.net/papers/2004/ATP-UI-article.pdf}}

@inproceedings{KorRic-DCDG-2001, Abstract = {Geometric straight-line programs [5,8] can be used to model geo- metric constructions and their implicit ambiguities. In this paper we discuss the complexity of deciding whether two instances of the same geometric straight-line program are connected by a continuous path, the Complex Reachability Problem.}, Address = {Heidelberg}, Author = {Kortenkamp, Ulrich and Richter-Gebert, J{\"u}rgen}, Booktitle = {Proceedings of ADG 2000}, Date-Modified = {2011-01-28 10:02:14 +0100}, Editor = {Wang, Dongming}, Keywords = {refereed}, Number = {2061}, Owner = {kortenka}, Pages = {167--172}, Pdf = {Kortenkamp2001a.pdf}, Publisher = {Springer-Verlag}, Series = {Lecture Notes in Artificial Intelligence}, Title = {Decision complexity in {D}ynamic {G}eometry}, Url = {http://kortenkamps.net/papers/2001/36_DecisionComplexity.pdf}, Year = {2001}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://kortenkamps.net/papers/2001/36_DecisionComplexity.pdf}}

@article{KorRicSarZie-EP0-1997, Abstract = {We provide lower and upper bounds for the maximal number of facets of a d-dimensional 0/1-polytope, and for the maximal number of vertices that can appear in a two-dimensional projection (``shadow) of such a polytope.}, Author = {Kortenkamp, Ulrich and Richter-Gebert, J{\"u}rgen and Sarangarajan, A. and Ziegler, G{\"u}nter M.}, Date-Modified = {2011-01-28 10:02:14 +0100}, Journal = {Discrete \& Computational Geometry}, Keywords = {refereed}, Language = {english}, Pages = {439--448}, Title = {Extremal properties of 0/1-polytopes}, Url = {http://link.springer.de/link/service/journals/00454/htabst/17n4p439.html}, Volume = {17}, Year = {1997}, Bdsk-Url-1 = {http://link.springer.de/link/service/journals/00454/htabst/17n4p439.html}}

@inproceedings{KorWet-SKC-2003, Address = {Hildesheim}, Author = {Kortenkamp, Ulrich and Weth, Thomas}, Booktitle = {Beitr{\"a}ge zum Mathematikunterricht. Vortr{\"a}ge auf der 37. Tagung f{\"u}r Didaktik der Mathematik in Dortmund}, Date-Modified = {2011-01-28 10:02:14 +0100}, Keywords = {invited}, Organization = {Gesellschaft f{\"u}r Didaktik der Mathematik}, Owner = {kortenka}, Pdf = {Kortenkamp2004d.pdf}, Publisher = {Franzbecker}, Title = {Syntaxfreie {K}onstruktionsbeschreibungen mit {C}inderella}, Year = {2003}, Bdsk-File-1 = {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}}

@inproceedings{RicKor-DACG-2000, Abstract = {Computational Geometry very often focuses on static problems, like computing the convex hull or Voronoi complex of a given set of points. Fundamentally new questions arise when the objects under consideration are no longer static, but may move around with respect to certain constraints. This scenario is not unusual, for instance every mechanism can be considered as a dynamic geometry entity. Here we focus on the new areas of problems that arise from genuinely dynamic effects. Constructions from elementary geometry play a crucial role in this context, since they form first natural instances of non-trivial examples where it is reasonable to study the dynamic behaviour. One of the most fundamental problems arises when one considers one point of an intersection of a line and a circle and allows the line to move around. Since the point of intersection is not unique, a computer program has to decide for every „discrete snapshot`` which of the two intersection points is meant. If this decision is not made correctly a „path-jumping`` of the point may occur. A careful analysis of the situation shows that for a satisfactory resolution of the problem one has to embed the configuration in an ambient complex projective space. One even has to take monodromy effects and underlying Riemann surfaces into account. We will develop a theory for the study of these phenomena. After this, we will investigate the algorithmic complexity of „making the right decision``. It will turn out that even in very weak versions this problem is NP-hard. In some stronger versions it is PSPACE hard or even undecidable. }, Address = {Barcelona}, Author = {Richter-Gebert, J{\"u}rgen and Kortenkamp, Ulrich}, Booktitle = {Proceedings of the EACA 2000}, Date-Modified = {2011-01-28 10:02:14 +0100}, Editor = {Montes, Antonio}, Keywords = {refereed}, Pages = {51--61}, Pdf = {Richter-Gebert2000b.pdf}, Title = {Dynamic aspects in computational geometry}, Year = {2000}, Bdsk-File-1 = {YnBsaXN0MDDUAQIDBAUGJCVYJHZlcnNpb25YJG9iamVjdHNZJGFyY2hpdmVyVCR0b3ASAAGGoKgHCBMUFRYaIVUkbnVsbNMJCgsMDxJXTlMua2V5c1pOUy5vYmplY3RzViRjbGFzc6INDoACgAOiEBGABIAFgAdccmVsYXRpdmVQYXRoWWFsaWFzRGF0YV8QKVBhcGVycy9Lb3J0ZW5rYW1wUmljaHRlci1HZS1EQUNHLTIwMDAucGRm0hcLGBlXTlMuZGF0YU8RAg4AAAAAAg4AAgAADE1hY2ludG9zaCBIRAAAAAAAAAAAAAAAAAAAAAAAAABCRAAB/////x9Lb3J0ZW5rYW1wUmljaHRlci0jRkZGRkZGRkYucGRmAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAD/////AAAAAAAAAAQAAAG1AAEAAwAACiBjdQAAAAAAAAAAAAAAAAAGUGFwZXJzAAIAeC86VXNlcnM6dWxsaTpDbG91ZHN0YXRpb246Q2xvdWRzdGF0aW9uIFVQOkVpZ2VuZSBQYXBlcnM6UHVibGlrYXRpb25lbiB2b24gVWxsaTpQYXBlcnM6S29ydGVua2FtcFJpY2h0ZXItR2UtREFDRy0yMDAwLnBkZgAOAEYAIgBLAG8AcgB0AGUAbgBrAGEAbQBwAFIAaQBjAGgAdABlAHIALQBHAGUALQBEAEEAQwBHAC0AMgAwADAAMAAuAHAAZABmAA8AGgAMAE0AYQBjAGkAbgB0AG8AcwBoACAASABEABIAdlVzZXJzL3VsbGkvQ2xvdWRzdGF0aW9uL0Nsb3Vkc3RhdGlvbiBVUC9FaWdlbmUgUGFwZXJzL1B1Ymxpa2F0aW9uZW4gdm9uIFVsbGkvUGFwZXJzL0tvcnRlbmthbXBSaWNodGVyLUdlLURBQ0ctMjAwMC5wZGYAEwABLwAAFQACAAv//wAAgAbSGxwdHlokY2xhc3NuYW1lWCRjbGFzc2VzXU5TTXV0YWJsZURhdGGjHR8gVk5TRGF0YVhOU09iamVjdNIbHCIjXE5TRGljdGlvbmFyeaIiIF8QD05TS2V5ZWRBcmNoaXZlctEmJ1Ryb290gAEACAARABoAIwAtADIANwBAAEYATQBVAGAAZwBqAGwAbgBxAHMAdQB3AIQAjgC6AL8AxwLZAtsC4ALrAvQDAgMGAw0DFgMbAygDKwM9A0ADRQAAAAAAAAIBAAAAAAAAACgAAAAAAAAAAAAAAAAAAANH}}

@inproceedings{RicKor-DGGM-2002, Author = {Richter-Gebert, J{\"u}rgen and Kortenkamp, Ulrich}, Booktitle = {Tagungsband zum N{\"u}rnberger Kolloquium zur Didaktik der Mathematik 2002}, Date-Modified = {2011-01-28 10:02:14 +0100}, Editor = {Weth, Thomas}, Keywords = {invited}, Owner = {kortenka}, Pages = {369-372}, Pdf = {Richter-Gebert2002a.pdf}, Title = {Dynamische {G}eometrie: {G}rundlagen und {M}{\"o}glichkeiten}, Url = {http://www.cinderella.de/papers/DG\_GM.pdf}, Year = {2002}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://www.cinderella.de/papers/DG%5C_GM.pdf}}

@inproceedings{RicKor-DSEG-2001, Abstract = {In this article we survey the theoretical background that is re- quired to build a consistent and continuous setup of dynamic elementary ge- ometry. Unlike in static elementary geometry in dynamic elementary geometry the elements of a construction are allowed to move around as long as the geo- metric constraints intended by the construction are not violated. A typical problem in such a scenario is to resolve ambiguous situations that arise from geometric operations like intersecting a circle and a line. After introducing a formal framework for dealing with dynamic geometric constructions, we will demonstrate that a suitable resolution of these ambiguities requires the con- sideration of complex projective spaces. We will discuss several aspects where one can benefit from such a rather general approach. Finally, we will sketch some proofs that show that several fundamental algorithmic problems arising in such a context are NP-hard or even harder.}, Author = {Richter-Gebert, J{\"u}rgen and Kortenkamp, Ulrich}, Booktitle = {Proceedings of MTCM 2000}, Date-Modified = {2011-01-28 10:02:14 +0100}, Keywords = {refereed}, Owner = {kortenka}, Pdf = {Richter-Gebert2001.pdf}, Publisher = {Springer-Verlag}, Title = {A dynamic setup for elementary geometry}, Url = {http://kortenkamps.net/papers/2001/35\_DynamicSetup.pdf}, Year = {2001}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://kortenkamps.net/papers/2001/35%5C_DynamicSetup.pdf}}

@book{RicKor-CIG-2000, Address = {Stuttgart}, Author = {Richter-Gebert, J{\"u}rgen and Kortenkamp, Ulrich H.}, Date-Modified = {2011-01-28 10:02:14 +0100}, Keywords = {software}, Owner = {kortenka}, Publisher = {HEUREKA-Klett Softwareverlag}, Series = {Clever lernen -- super Noten!}, Title = {Cinderella -- die interaktive {G}eometriesoftware}, Url = {http://cinderella.de}, Year = {2000}, Bdsk-Url-1 = {http://cinderella.de}}

@article{RicKor-ENGC-2000, Abstract = {Zusammenfassung: Wir erinnern an die Konzeption euklidischer und nicht-euklidischer Geometrie durch Klein und Cayley und weisen auf ihre Bedeutung fu ̈r moderne Software zur interaktiven (oder dynamischen) Geometrie hin. Insbesondere zeigt es sich, dass sich komplexe Zahlen vorzu ̈glich zu einer allgemein Behandlung hyperbolischer, elliptischer, euklidischer und anderer Geometrie eignen.

Summary: We recall the concepts of Euclidean and non-Euclidean Geometry in the sense of Klein and Cayley and illustrate their importance for modern interactive (dynamic) geometry software. In particular, the use of complex numbers turns out to be the key to the most general approach to measurements in hyperbolic, elliptic, Euclidean and other geometries.}, Author = {Richter-Gebert, J{\"u}rgen and Kortenkamp, Ulrich}, Date-Modified = {2011-01-28 10:02:14 +0100}, Journal = {Journal f{\"u}r Mathematikdidaktik}, Keywords = {refereed}, Owner = {kortenka}, Pages = {303--324}, Pdf = {Richter-Gebert2000a.pdf}, Title = {Euklidische und nicht-{E}uklidische {G}eometrie in {C}inderella}, Url = {http://kortenkamps.net/papers/2000/Euklidisch-NichtEuklidisch.pdf}, Volume = {22}, Year = {2000}, Bdsk-File-1 = {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}, Bdsk-Url-1 = {http://kortenkamps.net/papers/2000/Euklidisch-NichtEuklidisch.pdf}}

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