Editing PlanetMath (section)

{{Short description|Online encyclopedia}}
{{Infobox website
| name            = PlanetMath
| logo            = pmlogo.png
| logo_size       = 182px
| screenshot      =
| caption         =
| url             = {{URL|http://planetmath.org/}}
| commercial      = No
| owner           = PlanetMath.org, Ltd.
| content_license = [[CC BY-SA]]
| type            = [[Online encyclopedia]]
| language        = [[English language|English]]
| registration    = [[GitHub]] account required to edit sources via pull request
| author          = {{ubl|Nathan Egge|Aaron Krowne}}
| launch_date     =
| current_status  = Inactive
| revenue         =
}}
'''PlanetMath''' is a [[free content|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".<ref>Self-descriptions of PM {{cite web |url=http://planetmath.org/?op%3Dgetobj%26from%3Dcollab%26id%3D35#SECTION00021000000000000000 |title=Archived copy |access-date=2009-05-15 |url-status=live |archive-url=https://web.archive.org/web/20160826090901/http://planetmath.org/?op=getobj&from=collab&id=35 |archive-date=2016-08-26 }}, {{cite web |url=http://planetmath.org/?op%3Dabout |title=Planetmath.org &#124; Math for the people, by the people |access-date=2008-05-02 |url-status=live |archive-url=https://web.archive.org/web/20160611023918/http://planetmath.org/?op=about |archive-date=2016-06-11 }} {{cite web |url=http://aux.planetmath.org/doc/donate.html |title=Helping PlanetMath |access-date=2009-05-19 |url-status=dead |archive-url=https://web.archive.org/web/20080509123133/http://aux.planetmath.org/doc/donate.html |archive-date=2008-05-09 }}</ref>

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]].