# double counting

> technique for proving that two expressions are equal by showing that they both count the size of the same set

**Wikidata**: [Q1191750](https://www.wikidata.org/wiki/Q1191750)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Double_counting_(proof_technique))  
**Source**: https://4ort.xyz/entity/double-counting


## References

1. Freebase Data Dumps. 2013
2. Quora