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Theorem nffun 6561
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 6540 . 2 (Fun 𝐹 ↔ (Rel 𝐹 ∧ (𝐹𝐹) ⊆ I ))
2 nffun.1 . . . 4 𝑥𝐹
32nfrel 5768 . . 3 𝑥Rel 𝐹
42nfcnv 5866 . . . . 5 𝑥𝐹
52, 4nfco 5853 . . . 4 𝑥(𝐹𝐹)
6 nfcv 2925 . . . 4 𝑥 I
75, 6nfss 3931 . . 3 𝑥(𝐹𝐹) ⊆ I
83, 7nfan 1929 . 2 𝑥(Rel 𝐹 ∧ (𝐹𝐹) ⊆ I )
91, 8nfxfr 1883 1 𝑥Fun 𝐹
Colors of variables: wff setvar class
Syntax hints:  wa 400  wnf 1813  wnfc 2910  wss 3906   I cid 5557  ccnv 5662  ccom 5667  Rel wrel 5668  Fun wfun 6532
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-10 2176  ax-11 2192  ax-12 2213  ax-ext 2735
This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-nf 1814  df-sb 2097  df-clab 2742  df-cleq 2755  df-clel 2838  df-nfc 2912  df-ral 3080  df-rab 3417  df-v 3457  df-dif 3909  df-un 3911  df-ss 3923  df-nul 4288  df-if 4489  df-sn 4591  df-pr 4593  df-op 4597  df-br 5111  df-opab 5175  df-rel 5670  df-cnv 5671  df-co 5672  df-fun 6540
This theorem is referenced by:  nffn  6636  nff1  6774  fliftfun  7312  funimass4f  32963  nfdfat  47847
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