# positive element

> self-adjoint (or Hermitian) element A of a C*-algebra A is called positive if its spectrum σ (A) consists of non-negative real numbers

**Wikidata**: [Q2627013](https://www.wikidata.org/wiki/Q2627013)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Positive_operator)  
**Source**: https://4ort.xyz/entity/positive-element


## References

1. Freebase Data Dumps. 2013