- abraCAdaBRI - Yves Martin
Liens et exercises pour le logiciel Cabri Géomètre:
geéométries; affine plane; vectorielle plane; affine de l'espace; non euclidennes; logique (Alice); dossier coniques; pratique de Cabri. In French.
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- Advanced Geometry - Math Forum
Links to some of the best Internet resources for advanced geometry: Web sites, software, Internet projects, publications, and public forums for discussion.
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- Analytic and Descriptive Geometry - Dave Rusin; The Mathematical Atlas
An introduction to ordinary analytic geometry as studied in secondary school. (Also included here is a rather lengthy analysis of a result known as Poncelet's Porism.) History; applications and related fields and subfields; textbooks, reference works,
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- The Diamond Theorem - Steven H. Cullinane
Finite projective geometry explains the surprising symmetry properties of some simple graphic designs -- found, for instance, in quilts. Links are provided for applications to sporadic simple groups (via the "Miracle Octad Generator" of R. T. Curtis),
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- John Stembridge
John Stembridge researches algebra and combinatorics. His papers on these subjects are available online as gzipped PostScript files. The site contains an archive of related research data such as lists of posets on 8 or fewer vertices and Coxeter graph
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- The Medians - Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
Interactive proofs (elementary geometry, barycentric coordinates, complex numbers, Ceva's theorem, affine geometry) of the fact that the three medians of a triangle meet at a point called the centroid. See also The medians, contributed by Scott Brodie.
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- Q-Puzzle - XIAO Gang
A mathematical jigsaw puzzle: your goal is to recover a disordered photo by finding the inverse affine transformation. A French version is also available.
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