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Theorem fndmexb 5932
Description: The domain of a function is a set iff the function is a set. (Contributed by AV, 8-Aug-2024.)
Assertion
Ref Expression
fndmexb  |-  ( F  Fn  A  ->  ( A  e.  _V  <->  F  e.  _V ) )

Proof of Theorem fndmexb
StepHypRef Expression
1 fnex 5931 . . 3  |-  ( ( F  Fn  A  /\  A  e.  _V )  ->  F  e.  _V )
21ex 115 . 2  |-  ( F  Fn  A  ->  ( A  e.  _V  ->  F  e.  _V ) )
3 simpr 110 . . . 4  |-  ( ( F  Fn  A  /\  F  e.  _V )  ->  F  e.  _V )
4 simpl 109 . . . 4  |-  ( ( F  Fn  A  /\  F  e.  _V )  ->  F  Fn  A )
53, 4fndmexd 5579 . . 3  |-  ( ( F  Fn  A  /\  F  e.  _V )  ->  A  e.  _V )
65ex 115 . 2  |-  ( F  Fn  A  ->  ( F  e.  _V  ->  A  e.  _V ) )
72, 6impbid 129 1  |-  ( F  Fn  A  ->  ( A  e.  _V  <->  F  e.  _V ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    <-> wb 105    e. wcel 2209   _Vcvv 2821    Fn wfn 5370
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-14 2212  ax-ext 2220  ax-coll 4244  ax-sep 4247  ax-pow 4309  ax-pr 4344  ax-un 4576
This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-reu 2535  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3714  df-pr 3715  df-op 3717  df-uni 3934  df-iun 4012  df-br 4129  df-opab 4191  df-mpt 4192  df-id 4436  df-xp 4778  df-rel 4779  df-cnv 4780  df-co 4781  df-dm 4782  df-rn 4783  df-res 4784  df-ima 4785  df-iota 5335  df-fun 5377  df-fn 5378  df-f 5379  df-f1 5380  df-fo 5381  df-f1o 5382  df-fv 5383
This theorem is referenced by:  fdmexb  5933
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