# Hilbert's nineteenth problem

> one of the 23 Hilbert problems

**Wikidata**: [Q5761157](https://www.wikidata.org/wiki/Q5761157)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Hilbert's_nineteenth_problem)  
**Source**: https://4ort.xyz/entity/hilbert-s-nineteenth-problem