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An open mathematics library: from school math to the research frontier, in four languages.

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Top fieldsFoundations of mathematics Arithmetic and number theory Algebra Geometry Topology Analysis Differential equations and dynamical systems Combinatorics and discrete mathematics Probability and statistics Applied and computational mathematics

Featured mathematiciansSimon Donaldson Pierre Deligne Shing-Tung Yau Maxim Kontsevich Jean-Pierre Serre John G. Thompson Kiyoshi Itô Grigory Margulis Edward Witten Andrew Wiles

Featured great problemsAngle trisection with compass and straightedge Squaring the circle Doubling the cube Constructible regular polygons (Gauss–Wantzel)Odd perfect numbers Kepler conjecture Fermat's Last Theorem Finiteness of Fermat primes Infinitude of Mersenne primes Basel problem

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