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Theorem nffun 6564
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 6538 . 2 (Fun 𝐹 ↔ (Rel 𝐹 ∧ (𝐹𝐹) ⊆ I ))
2 nffun.1 . . . 4 𝑥𝐹
32nfrel 5763 . . 3 𝑥Rel 𝐹
42nfcnv 5863 . . . . 5 𝑥𝐹
52, 4nfco 5850 . . . 4 𝑥(𝐹𝐹)
6 nfcv 2899 . . . 4 𝑥 I
75, 6nfss 3956 . . 3 𝑥(𝐹𝐹) ⊆ I
83, 7nfan 1899 . 2 𝑥(Rel 𝐹 ∧ (𝐹𝐹) ⊆ I )
91, 8nfxfr 1853 1 𝑥Fun 𝐹
Colors of variables: wff setvar class
Syntax hints:  wa 395  wnf 1783  wnfc 2884  wss 3931   I cid 5552  ccnv 5658  ccom 5663  Rel wrel 5664  Fun wfun 6530
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 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2708
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-clab 2715  df-cleq 2728  df-clel 2810  df-nfc 2886  df-ral 3053  df-rab 3421  df-v 3466  df-dif 3934  df-un 3936  df-ss 3948  df-nul 4314  df-if 4506  df-sn 4607  df-pr 4609  df-op 4613  df-br 5125  df-opab 5187  df-rel 5666  df-cnv 5667  df-co 5668  df-fun 6538
This theorem is referenced by:  nffn  6642  nff1  6777  fliftfun  7310  funimass4f  32620  nfdfat  47136
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