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Theorem reldmmpo 6080
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 6053 . 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 5972 . . . . 5  |-  ( x  e.  A ,  y  e.  B  |->  C )  =  { <. <. x ,  y >. ,  z
>.  |  ( (
x  e.  A  /\  y  e.  B )  /\  z  =  C
) }
42, 3eqtri 2228 . . . 4  |-  F  =  { <. <. x ,  y
>. ,  z >.  |  ( ( x  e.  A  /\  y  e.  B )  /\  z  =  C ) }
54dmeqi 4898 . . 3  |-  dom  F  =  dom  { <. <. x ,  y >. ,  z
>.  |  ( (
x  e.  A  /\  y  e.  B )  /\  z  =  C
) }
65releqi 4776 . 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 1373    e. wcel 2178   dom cdm 4693   Rel wrel 4698   {coprab 5968    e. cmpo 5969
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 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-14 2181  ax-ext 2189  ax-sep 4178  ax-pow 4234  ax-pr 4269
This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-nf 1485  df-sb 1787  df-eu 2058  df-mo 2059  df-clab 2194  df-cleq 2200  df-clel 2203  df-nfc 2339  df-ral 2491  df-rex 2492  df-v 2778  df-un 3178  df-in 3180  df-ss 3187  df-pw 3628  df-sn 3649  df-pr 3650  df-op 3652  df-br 4060  df-opab 4122  df-xp 4699  df-rel 4700  df-dm 4703  df-oprab 5971  df-mpo 5972
This theorem is referenced by:  reldmmap  6767  reldmsets  12976  reldmress  13010  reldmprds  13215  reldmghm  13693  reldmpsr  14542  reldmmpl  14566
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