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ZF (ZERMELO-FRAENKEL) SET THEORY
ZF Set Theory - start with the Axiom of Extensionality
Negated equality and membership
Negated membership
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Table of Contents - 2.1.4.2. Negated membership
wnel
df-nel
neli
nelir
neleq12d
neleq1
neleq2
nfnel
nfneld
nnel
elnelne1
elnelne2
nelcon3d
elnelall
pm2.61danel