# Post correspondence problem

> undecidable decision problem

**Wikidata**: [Q798572](https://www.wikidata.org/wiki/Q798572)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Post_correspondence_problem)  
**Source**: https://4ort.xyz/entity/post-correspondence-problem


## References

1. Freebase Data Dumps. 2013