# set theory

> branch of mathematics that studies sets, which are collections of objects

**Wikidata**: [Q12482](https://www.wikidata.org/wiki/Q12482)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Set_theory)  
**Source**: https://4ort.xyz/entity/set-theory


## References

1. Nuovo soggettario
2. Freebase Data Dumps. 2013
3. Integrated Authority File
4. [Source](http://www.udcc.org/udcsummary/php/index.php?id=25403&lang=en)
5. YSO-Wikidata mapping project
6. BabelNet
7. Quora
8. National Library of Israel
9. KBpedia
10. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)