# Dehn's lemma

> theorem in topology

**Wikidata**: [Q3229337](https://www.wikidata.org/wiki/Q3229337)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Dehn's_lemma)  
**Source**: https://4ort.xyz/entity/dehn-s-lemma


## References

1. Freebase Data Dumps. 2013
2. [Dehn's Lemma. MathWorld](http://mathworld.wolfram.com/DehnsLemma.html)