# New Foundations

> axiomatic set theory permitting set comprehension by stratified formulae, hence with a universal set, but in which the singleton map 𝑥↦{𝑥} fails to exist

**Wikidata**: [Q649337](https://www.wikidata.org/wiki/Q649337)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/New_Foundations)  
**Source**: https://4ort.xyz/entity/new-foundations


## References

1. Freebase Data Dumps. 2013