# Hessenberg matrix

> square matrix that has zero entries below the first subdiagonal or has zero entries above the first superdiagonal

**Wikidata**: [Q428813](https://www.wikidata.org/wiki/Q428813)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Hessenberg_matrix)  
**Source**: https://4ort.xyz/entity/hessenberg-matrix


## References

1. Freebase Data Dumps. 2013