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ZF (ZERMELO-FRAENKEL) SET THEORY
ZF Set Theory - start with the Axiom of Extensionality
Power classes
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cpw
Metamath Proof Explorer
Ascii
Structured
Table of Contents - 2.1.17. Power classes
cpw
pwjust
df-pw
elpwg
elpw
velpw
elpwOLD
elpwgOLD
elpwd
elpwi
elpwb
elpwid
elelpwi
sspw
sspwi
sspwd
pweq
pweqALT
pweqi
pweqd
pwunss
nfpw
pwidg
pwidb
pwid
pwss
pwundif