# Bessel's inequality

> theorem

**Wikidata**: [Q794042](https://www.wikidata.org/wiki/Q794042)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Bessel's_inequality)  
**Source**: https://4ort.xyz/entity/bessel-s-inequality


## References

1. Freebase Data Dumps. 2013
2. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)