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Theorem reldmmpo 6143
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 6116 . 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 6033 . . . . 5  |-  ( x  e.  A ,  y  e.  B  |->  C )  =  { <. <. x ,  y >. ,  z
>.  |  ( (
x  e.  A  /\  y  e.  B )  /\  z  =  C
) }
42, 3eqtri 2252 . . . 4  |-  F  =  { <. <. x ,  y
>. ,  z >.  |  ( ( x  e.  A  /\  y  e.  B )  /\  z  =  C ) }
54dmeqi 4938 . . 3  |-  dom  F  =  dom  { <. <. x ,  y >. ,  z
>.  |  ( (
x  e.  A  /\  y  e.  B )  /\  z  =  C
) }
65releqi 4815 . 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 1398    e. wcel 2202   dom cdm 4731   Rel wrel 4736   {coprab 6029    e. cmpo 6030
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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-14 2205  ax-ext 2213  ax-sep 4212  ax-pow 4270  ax-pr 4305
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-ral 2516  df-rex 2517  df-v 2805  df-un 3205  df-in 3207  df-ss 3214  df-pw 3658  df-sn 3679  df-pr 3680  df-op 3682  df-br 4094  df-opab 4156  df-xp 4737  df-rel 4738  df-dm 4741  df-oprab 6032  df-mpo 6033
This theorem is referenced by:  reldmmap  6869  reldmsets  13191  reldmress  13226  reldmprds  13431  reldmghm  13909  reldmpsr  14761  reldmmpl  14790
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