PlanetMath

PlanetMath
Type of site
Online encyclopedia
Available inEnglish
OwnerPlanetMath.org, Ltd.
Created by
  • Nathan Egge
  • Aaron Krowne
URLplanetmath.org
CommercialNo
RegistrationGitHub account required to edit sources via pull request
Current statusInactive
Content license
CC BY-SA

PlanetMath is a free, collaborative, mathematics online encyclopedia. Intended to be comprehensive, the project is currently hosted by the University of Waterloo. The site is owned by a US-based nonprofit corporation, "PlanetMath.org, Ltd".[1]

PlanetMath was started when the popular free online mathematics encyclopedia MathWorld was temporarily taken offline for 12 months 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.

  1. ^ Self-descriptions of PM "Archived copy". Archived from the original on 2016-08-26. Retrieved 2009-05-15.{{cite web}}: CS1 maint: archived copy as title (link), "Planetmath.org | Math for the people, by the people". Archived from the original on 2016-06-11. Retrieved 2008-05-02. "Helping PlanetMath". Archived from the original on 2008-05-09. Retrieved 2009-05-19.