# Poincaré conjecture

> theorem in geometric topology that every simply connected, closed 3-manifold is homeomorphic to the 3-sphere

**Wikidata**: [Q203586](https://www.wikidata.org/wiki/Q203586)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Poincaré_conjecture)  
**Source**: https://4ort.xyz/entity/poincar-conjecture


## References

1. [Poincaré Conjecture. MathWorld](http://mathworld.wolfram.com/PoincareConjecture.html)
2. [Nuovo soggettario](https://thes.bncf.firenze.sbn.it/termine.php?id=49557)
3. Nuovo soggettario
4. Freebase Data Dumps. 2013
5. Integrated Authority File
6. BBC Things
7. National Library of Israel
8. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)