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Theorem nffun 6540
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 6519 . 2 (Fun 𝐹 ↔ (Rel 𝐹 ∧ (𝐹𝐹) ⊆ I ))
2 nffun.1 . . . 4 𝑥𝐹
32nfrel 5750 . . 3 𝑥Rel 𝐹
42nfcnv 5848 . . . . 5 𝑥𝐹
52, 4nfco 5835 . . . 4 𝑥(𝐹𝐹)
6 nfcv 2923 . . . 4 𝑥 I
75, 6nfss 3929 . . 3 𝑥(𝐹𝐹) ⊆ I
83, 7nfan 1918 . 2 𝑥(Rel 𝐹 ∧ (𝐹𝐹) ⊆ I )
91, 8nfxfr 1872 1 𝑥Fun 𝐹
Colors of variables: wff setvar class
Syntax hints:  wa 399  wnf 1802  wnfc 2908  wss 3904   I cid 5539  ccnv 5644  ccom 5649  Rel wrel 5650  Fun wfun 6511
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1814  ax-4 1828  ax-5 1929  ax-6 1986  ax-7 2027  ax-8 2143  ax-9 2151  ax-10 2174  ax-11 2190  ax-12 2211  ax-ext 2733
This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1099  df-tru 1562  df-fal 1572  df-ex 1799  df-nf 1803  df-sb 2090  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ral 3076  df-rab 3414  df-v 3455  df-dif 3907  df-un 3909  df-ss 3921  df-nul 4286  df-if 4480  df-sn 4582  df-pr 4584  df-op 4588  df-br 5100  df-opab 5162  df-rel 5652  df-cnv 5653  df-co 5654  df-fun 6519
This theorem is referenced by:  nffn  6616  nff1  6754  fliftfun  7292  funimass4f  32789  nfdfat  47685
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