MathWorld is an online encyclopedia of mathematics from Wolfram Research company based on Eric Weisstein’s CRC Concise Encyclopedia of Mathematics. Unlike PlanetMath, MathWorld does not use the Free Documentation License. Currently, Wolfram holds the to MathWorld (and hosts it on its website) and every entry is identified as being “From MathWorld–A Wolfram Web Resource.”

MathWorld was taken offline by a court injunction as a result of the CRC Press lawsuit against the Wolfram Research company and its employee (and MathWorld’s author) Eric Weisstein. See the collaboration PlanetMath FAQ for more details.

MathWorld has articles on the integers 17, 42, 163, 666 and 1729. MathWorld does not use the Mathematics Subject Classification to organize its entries.

In the On-Line Encyclopedia of Integer Sequences, MathWorld is one of the most often referenced mathematical web sites, with more than six thousand links as of early 2008. (Compare Wikipedia with 360 and PlanetMath with just 44).

The website is at

Title MathWorld
Canonical name MathWorld
Date of creation 2013-03-22 16:45:10
Last modified on 2013-03-22 16:45:10
Owner PrimeFan (13766)
Last modified by PrimeFan (13766)
Numerical id 6
Author PrimeFan (13766)
Entry type Definition
Classification msc 01A61
Classification msc 01A65