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Theorem dmmpo 6249
Description: Domain of a class given by the maps-to notation. (Contributed by FL, 17-May-2010.)
Hypotheses
Ref Expression
fmpo.1  |-  F  =  ( x  e.  A ,  y  e.  B  |->  C )
fnmpoi.2  |-  C  e. 
_V
Assertion
Ref Expression
dmmpo  |-  dom  F  =  ( A  X.  B )
Distinct variable groups:    x, A, y   
x, B, y
Allowed substitution hints:    C( x, y)    F( x, y)

Proof of Theorem dmmpo
StepHypRef Expression
1 fmpo.1 . . 3  |-  F  =  ( x  e.  A ,  y  e.  B  |->  C )
2 fnmpoi.2 . . 3  |-  C  e. 
_V
31, 2fnmpoi 6248 . 2  |-  F  Fn  ( A  X.  B
)
4 fndm 5345 . 2  |-  ( F  Fn  ( A  X.  B )  ->  dom  F  =  ( A  X.  B ) )
53, 4ax-mp 5 1  |-  dom  F  =  ( A  X.  B )
Colors of variables: wff set class
Syntax hints:    = wceq 1364    e. wcel 2164   _Vcvv 2760    X. cxp 4653   dom cdm 4655    Fn wfn 5241    e. cmpo 5912
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 710  ax-5 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-10 1516  ax-11 1517  ax-i12 1518  ax-bndl 1520  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546  ax-13 2166  ax-14 2167  ax-ext 2175  ax-sep 4147  ax-pow 4203  ax-pr 4238  ax-un 4462
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-nf 1472  df-sb 1774  df-eu 2045  df-mo 2046  df-clab 2180  df-cleq 2186  df-clel 2189  df-nfc 2325  df-ral 2477  df-rex 2478  df-rab 2481  df-v 2762  df-sbc 2986  df-csb 3081  df-un 3157  df-in 3159  df-ss 3166  df-pw 3603  df-sn 3624  df-pr 3625  df-op 3627  df-uni 3836  df-iun 3914  df-br 4030  df-opab 4091  df-mpt 4092  df-id 4322  df-xp 4661  df-rel 4662  df-cnv 4663  df-co 4664  df-dm 4665  df-rn 4666  df-res 4667  df-ima 4668  df-iota 5207  df-fun 5248  df-fn 5249  df-f 5250  df-fv 5254  df-oprab 5914  df-mpo 5915  df-1st 6184  df-2nd 6185
This theorem is referenced by:  genipdm  7566
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