MathWorld is an online mathematics reference work, created and largely written by Eric W.

[3] Eric W. Weisstein, the creator of the site, was a physics and astronomy student who got into the habit of writing notes on his mathematical readings.

[citation needed] In 2000, CRC Press sued Wolfram Research Inc. (WRI), WRI president Stephen Wolfram, and author Eric W. Weisstein, due to what they considered a breach of contract: that the MathWorld content was to remain in print only.

[4] The case was later settled out of court, with WRI paying an unspecified amount and complying with other stipulations.

Among these stipulations is the inclusion of a copyright notice at the bottom of the website and broad rights for the CRC Press to produce MathWorld in printed book form.