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Theorem nffun 6523
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 6502 . 2 (Fun 𝐹 ↔ (Rel 𝐹 ∧ (𝐹𝐹) ⊆ I ))
2 nffun.1 . . . 4 𝑥𝐹
32nfrel 5737 . . 3 𝑥Rel 𝐹
42nfcnv 5835 . . . . 5 𝑥𝐹
52, 4nfco 5822 . . . 4 𝑥(𝐹𝐹)
6 nfcv 2899 . . . 4 𝑥 I
75, 6nfss 3928 . . 3 𝑥(𝐹𝐹) ⊆ I
83, 7nfan 1901 . 2 𝑥(Rel 𝐹 ∧ (𝐹𝐹) ⊆ I )
91, 8nfxfr 1855 1 𝑥Fun 𝐹
Colors of variables: wff setvar class
Syntax hints:  wa 395  wnf 1785  wnfc 2884  wss 3903   I cid 5526  ccnv 5631  ccom 5636  Rel wrel 5637  Fun wfun 6494
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2709
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ral 3053  df-rab 3402  df-v 3444  df-dif 3906  df-un 3908  df-ss 3920  df-nul 4288  df-if 4482  df-sn 4583  df-pr 4585  df-op 4589  df-br 5101  df-opab 5163  df-rel 5639  df-cnv 5640  df-co 5641  df-fun 6502
This theorem is referenced by:  nffn  6599  nff1  6736  fliftfun  7268  funimass4f  32726  nfdfat  47481
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