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Zermelo Fraenkel with Atoms (ZFA)
Zermelo-Fraenkel with Atoms (ZFA)
Apr 27, 2026
1 min read
set-theory
Variant of ZF allowing urelements.
Urelement: an object not equal to
∅
and not containing anything.
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Zermelo–Fraenkel Set Theory with the Axiom of Choice
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