# Grötzsch's theorem

> theorem that every triangle-free planar graph is 3-colorable

**Wikidata**: [Q5612871](https://www.wikidata.org/wiki/Q5612871)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Grötzsch's_theorem)  
**Source**: https://4ort.xyz/entity/gr-tzsch-s-theorem