PlanetMath

PlanetMath is a free, collaborative, mathematics online encyclopedia. The emphasis is on rigour, openness, pedagogy, real-time content, interlinked content, and also community of about 24,000 people with various maths interests. 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".

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 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.

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