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Theorem dmmptg 5101
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 2165 . . 3  |-  ( x  e.  A  |->  B )  =  ( x  e.  A  |->  B )
21dmmpt 5099 . 2  |-  dom  (
x  e.  A  |->  B )  =  { x  e.  A  |  B  e.  _V }
3 elex 2737 . . . 4  |-  ( B  e.  V  ->  B  e.  _V )
43ralimi 2529 . . 3  |-  ( A. x  e.  A  B  e.  V  ->  A. x  e.  A  B  e.  _V )
5 rabid2 2642 . . 3  |-  ( A  =  { x  e.  A  |  B  e. 
_V }  <->  A. x  e.  A  B  e.  _V )
64, 5sylibr 133 . 2  |-  ( A. x  e.  A  B  e.  V  ->  A  =  { x  e.  A  |  B  e.  _V } )
72, 6eqtr4id 2218 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 1343    e. wcel 2136   A.wral 2444   {crab 2448   _Vcvv 2726    |-> cmpt 4043   dom cdm 4604
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-14 2139  ax-ext 2147  ax-sep 4100  ax-pow 4153  ax-pr 4187
This theorem depends on definitions:  df-bi 116  df-3an 970  df-tru 1346  df-nf 1449  df-sb 1751  df-eu 2017  df-mo 2018  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-ral 2449  df-rex 2450  df-rab 2453  df-v 2728  df-un 3120  df-in 3122  df-ss 3129  df-pw 3561  df-sn 3582  df-pr 3583  df-op 3585  df-br 3983  df-opab 4044  df-mpt 4045  df-xp 4610  df-rel 4611  df-cnv 4612  df-dm 4614  df-rn 4615  df-res 4616  df-ima 4617
This theorem is referenced by:  resfunexg  5706  rdgtfr  6342  rdgruledefgg  6343  negfi  11169  limccnp2lem  13285  dvmptclx  13320  dvmptaddx  13321  dvmptmulx  13322
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