# Grötzsch graph

> triangle-free graph requiring four colors

**Wikidata**: [Q3115494](https://www.wikidata.org/wiki/Q3115494)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Grötzsch_graph)  
**Source**: https://4ort.xyz/entity/gr-tzsch-graph


## References

1. House of Graphs