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ZF (ZERMELO-FRAENKEL) SET THEORY
ZF Set Theory - add the Axiom of Union
The natural numbers (i.e., finite ordinals)
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Table of Contents - 2.4.4. The natural numbers (i.e., finite ordinals)
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df-om
dfom2
elom
omsson
limomss
nnon
nnoni
nnord
trom
ordom
elnn
omon
omelon2
nnlim
omssnlim
limom
peano2b
nnsuc
omsucne
ssnlim
omsinds
omun