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Theorem nffun 6556
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 6535 . 2 (Fun 𝐹 ↔ (Rel 𝐹 ∧ (𝐹𝐹) ⊆ I ))
2 nffun.1 . . . 4 𝑥𝐹
32nfrel 5760 . . 3 𝑥Rel 𝐹
42nfcnv 5858 . . . . 5 𝑥𝐹
52, 4nfco 5845 . . . 4 𝑥(𝐹𝐹)
6 nfcv 2922 . . . 4 𝑥 I
75, 6nfss 3924 . . 3 𝑥(𝐹𝐹) ⊆ I
83, 7nfan 1932 . 2 𝑥(Rel 𝐹 ∧ (𝐹𝐹) ⊆ I )
91, 8nfxfr 1886 1 𝑥Fun 𝐹
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wa 401  wnf 1816  wnfc 2907  wss 3899   I cid 5549  ccnv 5654  ccom 5659  Rel wrel 5660  Fun wfun 6527
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2213  ax-ext 2732
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-ral 3077  df-rab 3413  df-v 3452  df-dif 3902  df-un 3904  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-br 5104  df-opab 5168  df-rel 5662  df-cnv 5663  df-co 5664  df-fun 6535
This theorem is used by:  nffn  6631  nff1  6769  fliftfun  7313  funimass4f  33110  nfdfat  48015
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