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Education
 Algebra Helper  Collection of tools created to assist students and teachers of algebra.
 Algebra Story and Word Problems  Collection of problems and solutions, providing a base for Integrated Thematic Instruction in mathematical problem solving.
 Ask Dr. Math  Provides answers to common questions on basic algebra, equations/graphs/translations, linear algebra, linear equations and polynomials.
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High School
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Tables
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Linear Algebra
 Abstract Linear Spaces  Article written by J.J. O'Connor and E.F. Robertson.
 Elementary Linear Algebra  Lecture notes by Keith Matthews. Includes solutions to problems.
 Elements of Abstract and Linear Algebra  Foundational textbook by Edwin H. Connell. Available for download in pdf, dvi, postscript, or gzipped postscript.
 Project Linbox: Exact Computational Linear Algebra  C template library for exact, highperformance linear algebra computation with dense, sparse, and structured matrices over the integers and over finite fields.
 Linear Algebra and Applications Textbook  Topics include linear systems of equations, matrix algebra, vector spaces, geometrical aspects of standard spaces, the eigenvalue problem, and geometrical aspects of abstract spaces.
 Linear Algebra from Math World  With links to various topics, including determinants, general linear algebra, linear independence, linear systems of equations, matrices, permanents and lie theory.
 Linear Algebra by Jim Hefferon  Text available for free download in pdf or postscript. Source in LaTeX and MetaPost.
 Linear Algebra Toolkit  With modules designed to help a linear algebra student learn and practice a basic linear algebra procedure, such as GaussJordan reduction, calculating the determinant, or checking for linear independence.
 Linear and Multilinear Algebra; Matrix Theory (Finite and Infinite)  Includes history, applications and related fields, subfields, textbooks and tutorials, software and tables, and links to related websites and topics.
 Lyryx Interactive Linear Algebra  Selfcontained introductory course in linear algebra and its applications, suitable for undergraduate university level.
 Matrix Multiplication  Javaenabled interactive microcourse for beginners.
 Notes on Linear Algebra  Files available in pdf or postscipt. Topics include inverse of a matrix, equivalents statements, equivalent characterizations of basic concepts, grammar lessons in algebra, pivotal role of zero, linear independence, and eigenvalues.
 Professor Strang's Linear Algebra Class Lecture Videos  Videotaped Lectures from MIT's Course 18.06: Linear Algebra.
 Topics in Linear Algebra  Extends the existing oneway connections among the solving linear systems of equations, matrix inversion, and linear programming. With illustrative numerical examples.
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Ring Theory
 Associative Rings and Algebras  Includes introduction, applications and related fields, references, software, and related links.
 Basic Books on Rings and Modules  Provides description of books on such topics as general theory of rings and modules, classical theory of artinian rings, and commutative rings.
 Nonassociative Rings and Algebras  Widens scope of rings to be studied, with emphasis on special cases of such rings such as Lie algebras and Jordan algebras.
 Lists of Ring Theorists  Mathematicians who study noncommutative, associative rings. With links to Web pages, email addresses, MathSciNet entries, when available.
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Geometry >
Polytopes
 The Geometry Junkyard: Polyhedra and Polytopes  Provides pointers on geometric properties of polygons, polyhedra, and higher dimensional polytopes (particularly convex polytopes).
 Guy's Polyhedra Pages  Includes papers, current research and random resources on such topics as general theory of polytopes and polyhedra, stellation and faceting, and spacefilling polyhedra.
 The Mathematical Atlas: Polytopes and Polyhedra  Covers geometric objects made from straight pieces. Discusses applications and related fields, textbooks and references, and related websites.
 Regular Polygons  Topics include geometric properties, diagonals, graphs, and Euler's formula, and supplements and links.
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Polychora
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Polyhedra
 Virtual Polyhedra  Provides a collection of thousands of virtual reality polyhedra. Serves as a free selfcontained tutorial, reference work, and object library for people interested in polyhedra.
 Polyhedra Gallery  From books in the Tarquin catalogue. Models can be viewed and manipulated in three dimensions; virtual reality.
 Juno's World  Includes puzzles, gallery of polyhedra and a collection of VRML models.
 Harold Scott MacDonald Coxeter  Specialized in geometry, particularly on polytopes, noneuclidean geometry, group theory and combinatorics.
 Mathematician's Portrait: Professor Emeritus H.S.M. Coxeter  Biography courtesy of the Mathematics Survival Guide, published by the Department of Mathematics, University of Toronto.
 Mathematical Models  Offers a set of models for purchase. Models made of solid aluminum, precision diecast, and available in four different painted colors.
 MultipleUnit Dodecahedral Constructions  By Stephan Werbeck. Features images and VRML models.
 Polyhedra Database  Solids include the regular polyhedra, Archimedean, some prisms and antiprisms, Archimedean duals, the Johnson solids (all convex polyhedra with regular faces) and some weird solids.
 Paper Models of Polyhedra  With over eighty paper models available for free.
 Pavilion of Polyhedreality  Practical polyhedra constructions by George W. Hart.
 Platonic Solids  Explores the question on why there can only be five Platonic solids.
 The Platonic Solids by Peter Alfeld  Provides general explanation, with java applets for illustration.
 Platonic Spheres  Presents a systematic approach to generating the Platonic bodies and discusses the symmetry of the Platonic spheres.
 Polyedergarten  Collection of constructions and VRML models. Also available in German or French versions.
 Polyhedra by Peter Cromwell  Book aimed at searching and presenting in a readable fashion the mathematics of polyhedra. With reviews, details, errata.
 Puzzling World of Polyhedral Dissections  Book by Stewart T. Coffin. Intended to be a puzzle designerb.
 Stellated Icosahedra  Excerpt of an article published in Mathematica in Education, discussing 59 stellations of the icosahedron.
 Studies into Polyhedra  Written by Anthony Thyssen. Topics include regular and semiregular polyhedra, prisms, deltahedra, Johnston solids, and known polyhedral mathematical formula.
 Superliminal Geometry Page  Includes regular polyhedra, infinite polyhedra, flexible polyhedra, and hyperbolic tessellations. With images and links to 3D images and Tyler applets.
 Symmetry, Crystals and Polyhedra  By Steven Dutch. Discusses symmetry concepts, crystallography, tilings, and different types of polyhedra.
 Uniform Polyhedra  Provides an excerpt of Chapter 9 of R. Maeder's book, The Mathematica Programmer II. With images and animation of 80 polyhedra.
 Zvi Harb  Senior lecturer at the Department of Mathematics at the Technion, Israel Institute of Technology. With links to papers available in ps or dvi, and software packages.
 Polyhedra by Bob  Describes the Platonic Solids, Archimedian Solids and Catalan Solids. With download links to Poly, a dos program to study the truncations and transformations of the Platonic Solids.
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Software
 Peek  Program for Ndimensional polytope visualization by crosssection and projection.
 Poly  Shareware program for exploring and constructing polyhedra. Fullyfunctional evaluation version available for download.
 PPL: The Parma Polyhedra Library  C library providing numerical abstractions especially targeted at applications in the field of analysis and verification of complex systems.
