# Urysohn's lemma

> lemma that a topological space is normal iff any 2 disjoint closed subsets can be separated by a continuous function

**Wikidata**: [Q1816967](https://www.wikidata.org/wiki/Q1816967)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Urysohn's_lemma)  
**Source**: https://4ort.xyz/entity/urysohn-s-lemma


## References

1. Freebase Data Dumps. 2013