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Theorem nffun 5395
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 5374 . 2  |-  ( Fun 
F  <->  ( Rel  F  /\  ( F  o.  `' F )  C_  _I  ) )
2 nffun.1 . . . 4  |-  F/_ x F
32nfrel 4855 . . 3  |-  F/ x Rel  F
42nfcnv 4954 . . . . 5  |-  F/_ x `' F
52, 4nfco 4940 . . . 4  |-  F/_ x
( F  o.  `' F )
6 nfcv 2392 . . . 4  |-  F/_ x  _I
75, 6nfss 3241 . . 3  |-  F/ x
( F  o.  `' F )  C_  _I
83, 7nfan 1618 . 2  |-  F/ x
( Rel  F  /\  ( F  o.  `' F )  C_  _I  )
91, 8nfxfr 1527 1  |-  F/ x Fun  F
Colors of variables: wff set class
Syntax hints:    /\ wa 104   F/wnf 1513   F/_wnfc 2379    C_ wss 3220    _I cid 4428   `'ccnv 4768    o. ccom 4773   Rel wrel 4774   Fun wfun 5366
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 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220
This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-v 2823  df-un 3224  df-in 3226  df-ss 3233  df-sn 3711  df-pr 3712  df-op 3714  df-br 4126  df-opab 4188  df-rel 4776  df-cnv 4777  df-co 4778  df-fun 5374
This theorem is referenced by:  nffn  5472  nff1  5591  fliftfun  5992  funimass4f  6349
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