# Cotton tensor

> rank-3 tensor defined for a 3d (pseudo-)Riemannian manifold which measures the degree to which it fails to be conformally flat

**Wikidata**: [Q3518152](https://www.wikidata.org/wiki/Q3518152)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Cotton_tensor)  
**Source**: https://4ort.xyz/entity/cotton-tensor


## References

1. Freebase Data Dumps. 2013