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Theorem nffun 6563
Description: Bound-variable hypothesis builder for a function. (Contributed by NM, 30-Jan-2004.)
Hypothesis
Ref Expression
nffun.1 𝑥𝐹
Assertion
Ref Expression
nffun 𝑥Fun 𝐹

Proof of Theorem nffun
StepHypRef Expression
1 df-fun 6542 . 2 (Fun 𝐹 ↔ (Rel 𝐹 ∧ (𝐹𝐹) ⊆ I ))
2 nffun.1 . . . 4 𝑥𝐹
32nfrel 5768 . . 3 𝑥Rel 𝐹
42nfcnv 5866 . . . . 5 𝑥𝐹
52, 4nfco 5853 . . . 4 𝑥(𝐹𝐹)
6 nfcv 2927 . . . 4 𝑥 I
75, 6nfss 3931 . . 3 𝑥(𝐹𝐹) ⊆ I
83, 7nfan 1932 . 2 𝑥(Rel 𝐹 ∧ (𝐹𝐹) ⊆ I )
91, 8nfxfr 1886 1 𝑥Fun 𝐹
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wa 401  wnf 1816  wnfc 2912  wss 3906   I cid 5557  ccnv 5662  ccom 5667  Rel wrel 5668  Fun wfun 6534
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2148  ax-9 2156  ax-10 2179  ax-11 2195  ax-12 2216  ax-ext 2737
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-clab 2744  df-cleq 2757  df-clel 2840  df-nfc 2914  df-ral 3082  df-rab 3419  df-v 3459  df-dif 3909  df-un 3911  df-ss 3923  df-nul 4287  df-if 4490  df-sn 4592  df-pr 4594  df-op 4598  df-br 5112  df-opab 5176  df-rel 5670  df-cnv 5671  df-co 5672  df-fun 6542
This theorem is used by:  nffn  6638  nff1  6776  fliftfun  7316  funimass4f  33029  nfdfat  47897
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