What it does
PlanetMath provides mathematical encyclopedia entries written and reviewed by its members, with subject and alphabetical indexes.
Browse the subject index when you know the area but not the exact name of a concept. PlanetMath links mathematical entries to one another, supporting further reading from a definition. Its community-written model is part of the reference's identity. Use the entry's own context and connections to decide where it fits in your study.
PlanetMath states that contributed entries use a Creative Commons Attribution-ShareAlike licence. Keep the entry attribution and licence when adapting that content.
Sources
- PlanetMath.org (Oct 26, 2026)