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ZF (ZERMELO-FRAENKEL) SET THEORY
ZF Set Theory - add the Axiom of Infinity
Transitive closure
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Metamath Proof Explorer
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Structured
Table of Contents - 2.6.4. Transitive closure
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tz9.1
tz9.1c
epfrs
zfregs
zfregs2
setind
setind2
ctc
df-tc
tcvalg
tcid
tctr
tcmin
tc2
tcsni
tcss
tcel
tcidm
tc0
tc00