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Theorem nffun 4944
Description: Bound-variable hypothesis builder for a function. (Contributed by NM, 30-Jan-2004.)
Hypothesis
Ref Expression
nffun.1  |-  F/_ x F
Assertion
Ref Expression
nffun  |-  F/ x Fun  F

Proof of Theorem nffun
StepHypRef Expression
1 df-fun 4924 . 2  |-  ( Fun 
F  <->  ( Rel  F  /\  ( F  o.  `' F )  C_  _I  ) )
2 nffun.1 . . . 4  |-  F/_ x F
32nfrel 4443 . . 3  |-  F/ x Rel  F
42nfcnv 4532 . . . . 5  |-  F/_ x `' F
52, 4nfco 4519 . . . 4  |-  F/_ x
( F  o.  `' F )
6 nfcv 2219 . . . 4  |-  F/_ x  _I
75, 6nfss 2992 . . 3  |-  F/ x
( F  o.  `' F )  C_  _I
83, 7nfan 1497 . 2  |-  F/ x
( Rel  F  /\  ( F  o.  `' F )  C_  _I  )
91, 8nfxfr 1403 1  |-  F/ x Fun  F
Colors of variables: wff set class
Syntax hints:    /\ wa 102   F/wnf 1389   F/_wnfc 2206    C_ wss 2973    _I cid 4043   `'ccnv 4362    o. ccom 4367   Rel wrel 4368   Fun wfun 4916
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-io 662  ax-5 1376  ax-7 1377  ax-gen 1378  ax-ie1 1422  ax-ie2 1423  ax-8 1435  ax-10 1436  ax-11 1437  ax-i12 1438  ax-bndl 1439  ax-4 1440  ax-17 1459  ax-i9 1463  ax-ial 1467  ax-i5r 1468  ax-ext 2063
This theorem depends on definitions:  df-bi 115  df-3an 921  df-tru 1287  df-nf 1390  df-sb 1686  df-clab 2068  df-cleq 2074  df-clel 2077  df-nfc 2208  df-ral 2353  df-v 2603  df-un 2977  df-in 2979  df-ss 2986  df-sn 3404  df-pr 3405  df-op 3407  df-br 3786  df-opab 3840  df-rel 4370  df-cnv 4371  df-co 4372  df-fun 4924
This theorem is referenced by:  nffn  5015  nff1  5110  fliftfun  5456
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