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Theorem nffun 6381
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 6360 . 2 (Fun 𝐹 ↔ (Rel 𝐹 ∧ (𝐹𝐹) ⊆ I ))
2 nffun.1 . . . 4 𝑥𝐹
32nfrel 5657 . . 3 𝑥Rel 𝐹
42nfcnv 5752 . . . . 5 𝑥𝐹
52, 4nfco 5739 . . . 4 𝑥(𝐹𝐹)
6 nfcv 2980 . . . 4 𝑥 I
75, 6nfss 3963 . . 3 𝑥(𝐹𝐹) ⊆ I
83, 7nfan 1899 . 2 𝑥(Rel 𝐹 ∧ (𝐹𝐹) ⊆ I )
91, 8nfxfr 1852 1 𝑥Fun 𝐹
Colors of variables: wff setvar class
Syntax hints:  wa 398  wnf 1783  wnfc 2964  wss 3939   I cid 5462  ccnv 5557  ccom 5562  Rel wrel 5563  Fun wfun 6352
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1969  ax-7 2014  ax-8 2115  ax-9 2123  ax-10 2144  ax-11 2160  ax-12 2176  ax-ext 2796
This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1539  df-ex 1780  df-nf 1784  df-sb 2069  df-clab 2803  df-cleq 2817  df-clel 2896  df-nfc 2966  df-ral 3146  df-rab 3150  df-v 3499  df-dif 3942  df-un 3944  df-in 3946  df-ss 3955  df-nul 4295  df-if 4471  df-sn 4571  df-pr 4573  df-op 4577  df-br 5070  df-opab 5132  df-rel 5565  df-cnv 5566  df-co 5567  df-fun 6360
This theorem is referenced by:  nffn  6455  nff1  6576  fliftfun  7068  funimass4f  30385  nfdfat  43333
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