(Q7049089)
Statements
Identifiers
Sitelinks
Wikipedia(5 entries)
- enwiki Non-well-founded set theory
- fawiki نظریه مجموعههای ناخوشبنیان
- frwiki Théorie des ensembles non bien fondés
- jawiki 非有基的集合論
- ptwiki Hiperconjunto
variants of axiomatic set theory that allow sets to be elements of themselves