# open problem

> known problem or question which is thought to have an objective and verifiable solution or explanation, but which has not yet been solved

**Wikidata**: [Q1321906](https://www.wikidata.org/wiki/Q1321906)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Open_problem)  
**Source**: https://4ort.xyz/entity/open-problem


## References

1. Freebase Data Dumps. 2013