# pigeonhole principle

> mathematical lemma that, if 𝑛 items are put into 𝑚 containers, with 𝑛>𝑚, then at least one container must contain more than one item

**Wikidata**: [Q188276](https://www.wikidata.org/wiki/Q188276)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Pigeonhole_principle)  
**Source**: https://4ort.xyz/entity/pigeonhole-principle


## References

1. [Source](http://mathworld.wolfram.com/DirichletsBoxPrinciple.html)
2. Freebase Data Dumps. 2013
3. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)