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Theorem nffun 5826
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 5806 . 2 (Fun 𝐹 ↔ (Rel 𝐹 ∧ (𝐹𝐹) ⊆ I ))
2 nffun.1 . . . 4 𝑥𝐹
32nfrel 5127 . . 3 𝑥Rel 𝐹
42nfcnv 5223 . . . . 5 𝑥𝐹
52, 4nfco 5209 . . . 4 𝑥(𝐹𝐹)
6 nfcv 2751 . . . 4 𝑥 I
75, 6nfss 3561 . . 3 𝑥(𝐹𝐹) ⊆ I
83, 7nfan 1816 . 2 𝑥(Rel 𝐹 ∧ (𝐹𝐹) ⊆ I )
91, 8nfxfr 1771 1 𝑥Fun 𝐹
Colors of variables: wff setvar class
Syntax hints:  wa 383  wnf 1699  wnfc 2738  wss 3540   I cid 4948  ccnv 5037  ccom 5042  Rel wrel 5043  Fun wfun 5798
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590
This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ral 2901  df-rab 2905  df-v 3175  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-nul 3875  df-if 4037  df-sn 4126  df-pr 4128  df-op 4132  df-br 4584  df-opab 4644  df-rel 5045  df-cnv 5046  df-co 5047  df-fun 5806
This theorem is referenced by:  nffn  5901  nff1  6012  fliftfun  6462  funimass4f  28818  nfdfat  39859
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