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Eric\'s Treasure Trove
Created, developed and nurtured by Eric Weisstein with contributions from the world's mathematical community, offers a complete, open-access encyclopaedia in the field of Mathematics. Indexed both alphabetically and by subject, each entry contains equations, animations, geometric pictures, historical data, cross-references and bibliographic notes. It covers all branches of Mathematics, from Classical Geometry to modern Cryptography, from recreational games and puzzles to an history of terminology. The pages deeply use the Mathematica® program for Symbolic Calculus.