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Theorem fdmexb 5910
Description: The domain of a function is a set iff the function is a set. (Contributed by AV, 8-Aug-2024.)
Assertion
Ref Expression
fdmexb  |-  ( F : A --> B  -> 
( A  e.  _V  <->  F  e.  _V ) )

Proof of Theorem fdmexb
StepHypRef Expression
1 ffn 5510 . 2  |-  ( F : A --> B  ->  F  Fn  A )
2 fndmexb 5909 . 2  |-  ( F  Fn  A  ->  ( A  e.  _V  <->  F  e.  _V ) )
31, 2syl 14 1  |-  ( F : A --> B  -> 
( A  e.  _V  <->  F  e.  _V ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 105    e. wcel 2205   _Vcvv 2815    Fn wfn 5349   -->wf 5350
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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2207  ax-14 2208  ax-ext 2216  ax-coll 4227  ax-sep 4230  ax-pow 4289  ax-pr 4324  ax-un 4556
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ral 2527  df-rex 2528  df-reu 2529  df-rab 2531  df-v 2817  df-sbc 3045  df-csb 3141  df-un 3217  df-in 3219  df-ss 3226  df-pw 3673  df-sn 3697  df-pr 3698  df-op 3700  df-uni 3917  df-iun 3995  df-br 4112  df-opab 4174  df-mpt 4175  df-id 4416  df-xp 4757  df-rel 4758  df-cnv 4759  df-co 4760  df-dm 4761  df-rn 4762  df-res 4763  df-ima 4764  df-iota 5314  df-fun 5356  df-fn 5357  df-f 5358  df-f1 5359  df-fo 5360  df-f1o 5361  df-fv 5362
This theorem is referenced by: (None)
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