Also known as planetmath.org
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".
via Wikipedia infobox
PlanetMath è una enciclopedia matematica online, a carattere collaborativo e a contenuto libero. Il progetto è ospitato presso il Digital Library Research Lab del Virginia Tech.
Abstract from DBpedia / Wikipedia · CC BY-SA
via Wikidata · CC0
via Wikidata sitelinks · CC0
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).