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Theorem nffun 4924
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 4904 . 2 (Fun 𝐹 ↔ (Rel 𝐹 ∧ (𝐹𝐹) ⊆ I ))
2 nffun.1 . . . 4 𝑥𝐹
32nfrel 4425 . . 3 𝑥Rel 𝐹
42nfcnv 4514 . . . . 5 𝑥𝐹
52, 4nfco 4501 . . . 4 𝑥(𝐹𝐹)
6 nfcv 2178 . . . 4 𝑥 I
75, 6nfss 2938 . . 3 𝑥(𝐹𝐹) ⊆ I
83, 7nfan 1457 . 2 𝑥(Rel 𝐹 ∧ (𝐹𝐹) ⊆ I )
91, 8nfxfr 1363 1 𝑥Fun 𝐹
Colors of variables: wff set class
Syntax hints:  wa 97  wnf 1349  wnfc 2165  wss 2917   I cid 4025  ccnv 4344  ccom 4349  Rel wrel 4350  Fun wfun 4896
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 630  ax-5 1336  ax-7 1337  ax-gen 1338  ax-ie1 1382  ax-ie2 1383  ax-8 1395  ax-10 1396  ax-11 1397  ax-i12 1398  ax-bndl 1399  ax-4 1400  ax-17 1419  ax-i9 1423  ax-ial 1427  ax-i5r 1428  ax-ext 2022
This theorem depends on definitions:  df-bi 110  df-3an 887  df-tru 1246  df-nf 1350  df-sb 1646  df-clab 2027  df-cleq 2033  df-clel 2036  df-nfc 2167  df-ral 2311  df-v 2559  df-un 2922  df-in 2924  df-ss 2931  df-sn 3381  df-pr 3382  df-op 3384  df-br 3765  df-opab 3819  df-rel 4352  df-cnv 4353  df-co 4354  df-fun 4904
This theorem is referenced by:  nffn  4995  nff1  5090  fliftfun  5436
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