# Morse–Kelley set theory

> first‐order axiomatic set theory permitting proper classes and class comprehension with bound (possibly proper) classes

**Wikidata**: [Q3490369](https://www.wikidata.org/wiki/Q3490369)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Morse–Kelley_set_theory)  
**Source**: https://4ort.xyz/entity/morse-kelley-set-theory


## References

1. Freebase Data Dumps. 2013