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Theorem reldmmpo 6038
Description: The domain of an operation defined by maps-to notation is a relation. (Contributed by Stefan O'Rear, 27-Nov-2014.)
Hypothesis
Ref Expression
rngop.1  |-  F  =  ( x  e.  A ,  y  e.  B  |->  C )
Assertion
Ref Expression
reldmmpo  |-  Rel  dom  F
Distinct variable groups:    y, A    x, y
Allowed substitution hints:    A( x)    B( x, y)    C( x, y)    F( x, y)

Proof of Theorem reldmmpo
Dummy variable  z is distinct from all other variables.
StepHypRef Expression
1 reldmoprab 6011 . 2  |-  Rel  dom  {
<. <. x ,  y
>. ,  z >.  |  ( ( x  e.  A  /\  y  e.  B )  /\  z  =  C ) }
2 rngop.1 . . . . 5  |-  F  =  ( x  e.  A ,  y  e.  B  |->  C )
3 df-mpo 5930 . . . . 5  |-  ( x  e.  A ,  y  e.  B  |->  C )  =  { <. <. x ,  y >. ,  z
>.  |  ( (
x  e.  A  /\  y  e.  B )  /\  z  =  C
) }
42, 3eqtri 2217 . . . 4  |-  F  =  { <. <. x ,  y
>. ,  z >.  |  ( ( x  e.  A  /\  y  e.  B )  /\  z  =  C ) }
54dmeqi 4868 . . 3  |-  dom  F  =  dom  { <. <. x ,  y >. ,  z
>.  |  ( (
x  e.  A  /\  y  e.  B )  /\  z  =  C
) }
65releqi 4747 . 2  |-  ( Rel 
dom  F  <->  Rel  dom  { <. <. x ,  y >. ,  z
>.  |  ( (
x  e.  A  /\  y  e.  B )  /\  z  =  C
) } )
71, 6mpbir 146 1  |-  Rel  dom  F
Colors of variables: wff set class
Syntax hints:    /\ wa 104    = wceq 1364    e. wcel 2167   dom cdm 4664   Rel wrel 4669   {coprab 5926    e. cmpo 5927
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 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-14 2170  ax-ext 2178  ax-sep 4152  ax-pow 4208  ax-pr 4243
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-nf 1475  df-sb 1777  df-eu 2048  df-mo 2049  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-ral 2480  df-rex 2481  df-v 2765  df-un 3161  df-in 3163  df-ss 3170  df-pw 3608  df-sn 3629  df-pr 3630  df-op 3632  df-br 4035  df-opab 4096  df-xp 4670  df-rel 4671  df-dm 4674  df-oprab 5929  df-mpo 5930
This theorem is referenced by:  reldmmap  6725  reldmsets  12732  reldmress  12766  reldmprds  12970  reldmghm  13448  reldmpsr  14295
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