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Theorem dmmptg 5234
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 2231 . . 3  |-  ( x  e.  A  |->  B )  =  ( x  e.  A  |->  B )
21dmmpt 5232 . 2  |-  dom  (
x  e.  A  |->  B )  =  { x  e.  A  |  B  e.  _V }
3 elex 2814 . . . 4  |-  ( B  e.  V  ->  B  e.  _V )
43ralimi 2595 . . 3  |-  ( A. x  e.  A  B  e.  V  ->  A. x  e.  A  B  e.  _V )
5 rabid2 2710 . . 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 2283 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 1397    e. wcel 2202   A.wral 2510   {crab 2514   _Vcvv 2802    |-> cmpt 4150   dom cdm 4725
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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299
This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ral 2515  df-rex 2516  df-rab 2519  df-v 2804  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-br 4089  df-opab 4151  df-mpt 4152  df-xp 4731  df-rel 4732  df-cnv 4733  df-dm 4735  df-rn 4736  df-res 4737  df-ima 4738
This theorem is referenced by:  resfunexg  5874  rdgtfr  6539  rdgruledefgg  6540  swrd0g  11240  negfi  11788  limccnp2lem  15399  dvmptclx  15441  dvmptaddx  15442  dvmptmulx  15443
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