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Theorem nffun 5356
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 5335 . 2 (Fun 𝐹 ↔ (Rel 𝐹 ∧ (𝐹𝐹) ⊆ I ))
2 nffun.1 . . . 4 𝑥𝐹
32nfrel 4817 . . 3 𝑥Rel 𝐹
42nfcnv 4915 . . . . 5 𝑥𝐹
52, 4nfco 4901 . . . 4 𝑥(𝐹𝐹)
6 nfcv 2375 . . . 4 𝑥 I
75, 6nfss 3221 . . 3 𝑥(𝐹𝐹) ⊆ I
83, 7nfan 1614 . 2 𝑥(Rel 𝐹 ∧ (𝐹𝐹) ⊆ I )
91, 8nfxfr 1523 1 𝑥Fun 𝐹
Colors of variables: wff set class
Syntax hints:  wa 104  wnf 1509  wnfc 2362  wss 3201   I cid 4391  ccnv 4730  ccom 4735  Rel wrel 4736  Fun wfun 5327
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-ext 2213
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-ral 2516  df-v 2805  df-un 3205  df-in 3207  df-ss 3214  df-sn 3679  df-pr 3680  df-op 3682  df-br 4094  df-opab 4156  df-rel 4738  df-cnv 4739  df-co 4740  df-fun 5335
This theorem is referenced by:  nffn  5433  nff1  5549  fliftfun  5947
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