Mathematical Treasure Trove

A is for Alexander’s horned sphere. B is for the Berry conjecture. C is for Catalan number. Astronomer Eric W. Weisstein of the University of Virginia has assembled an amazing compendium of mathematical terms. His online math encyclopedia features detailed explanations and definitions, a variety of illustrations, references, and Web links, ranging from A-integrable to the Zsigmondy theorem—17,280 entries in all, and still growing!

Go to: http://mathworld.wolfram.com/