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ZF (ZERMELO-FRAENKEL) SET THEORY
ZF Set Theory - add the Axiom of Union
Well-ordered recursion
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cwrecs
Metamath Proof Explorer
Ascii
Structured
Table of Contents - 2.4.18. Well-ordered recursion
cwrecs
df-wrecs
wrecseq123
nfwrecs
wrecseq1
wrecseq2
wrecseq3
csbwrecsg
wfr3g
wfrrel
wfrdmss
wfrdmcl
wfrfun
wfrresex
wfr2a
wfr1
wfr2
wfr3