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Encyclopedia of dynamical systems ****

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Mathematical part of Scholarpedia ( EN ).

PlanetMath Encyclopedia *

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A simple encyclopedia ( EN ).

Britannica Concise Encyclopedia **

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Full encyclopaedia ( EN ). Mathematics intro article ( EN ).

Wolfram MathWorld ****

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Useful and large online encyclopaedia of mathematics ( EN ).

The PRIME encyclopedia **

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Basics, you can browse alphabeticaly ( EN ).

Encyclopaedia of Mathematics **

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In 2010 it covers 8,000 entries and illuminates nearly 50,000 notions in mathematics ( EN )