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Theorem dmmptg 5199
Description: The domain of the mapping operation is the stated domain, if the function value is always a set. (Contributed by Mario Carneiro, 9-Feb-2013.) (Revised by Mario Carneiro, 14-Sep-2013.)
Assertion
Ref Expression
dmmptg  |-  ( A. x  e.  A  B  e.  V  ->  dom  (
x  e.  A  |->  B )  =  A )
Distinct variable group:    x, A
Allowed substitution hints:    B( x)    V( x)

Proof of Theorem dmmptg
StepHypRef Expression
1 eqid 2207 . . 3  |-  ( x  e.  A  |->  B )  =  ( x  e.  A  |->  B )
21dmmpt 5197 . 2  |-  dom  (
x  e.  A  |->  B )  =  { x  e.  A  |  B  e.  _V }
3 elex 2788 . . . 4  |-  ( B  e.  V  ->  B  e.  _V )
43ralimi 2571 . . 3  |-  ( A. x  e.  A  B  e.  V  ->  A. x  e.  A  B  e.  _V )
5 rabid2 2685 . . 3  |-  ( A  =  { x  e.  A  |  B  e. 
_V }  <->  A. x  e.  A  B  e.  _V )
64, 5sylibr 134 . 2  |-  ( A. x  e.  A  B  e.  V  ->  A  =  { x  e.  A  |  B  e.  _V } )
72, 6eqtr4id 2259 1  |-  ( A. x  e.  A  B  e.  V  ->  dom  (
x  e.  A  |->  B )  =  A )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1373    e. wcel 2178   A.wral 2486   {crab 2490   _Vcvv 2776    |-> cmpt 4121   dom cdm 4693
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 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-14 2181  ax-ext 2189  ax-sep 4178  ax-pow 4234  ax-pr 4269
This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-nf 1485  df-sb 1787  df-eu 2058  df-mo 2059  df-clab 2194  df-cleq 2200  df-clel 2203  df-nfc 2339  df-ral 2491  df-rex 2492  df-rab 2495  df-v 2778  df-un 3178  df-in 3180  df-ss 3187  df-pw 3628  df-sn 3649  df-pr 3650  df-op 3652  df-br 4060  df-opab 4122  df-mpt 4123  df-xp 4699  df-rel 4700  df-cnv 4701  df-dm 4703  df-rn 4704  df-res 4705  df-ima 4706
This theorem is referenced by:  resfunexg  5828  rdgtfr  6483  rdgruledefgg  6484  swrd0g  11151  negfi  11654  limccnp2lem  15263  dvmptclx  15305  dvmptaddx  15306  dvmptmulx  15307
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