Theorem reldmmpo 5986

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.

Step	Hyp	Ref	Expression
1		reldmoprab 5960	. 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 5880	. . . . 5 |- ( x e. A , y e. B |-> C ) = { <. <. x , y >. , z >. | ( ( x e. A /\ y e. B ) /\ z = C ) }
4	2, 3	eqtri 2198	. . . 4 |- F = { <. <. x , y >. , z >. | ( ( x e. A /\ y e. B ) /\ z = C ) }
5	4	dmeqi 4829	. . 3 |- dom F = dom { <. <. x , y >. , z >. | ( ( x e. A /\ y e. B ) /\ z = C ) }
6	5	releqi 4710	. 2 |- ( Rel dom F <-> Rel dom { <. <. x , y >. , z >. | ( ( x e. A /\ y e. B ) /\ z = C ) } )
7	1, 6	mpbir 146	1 |- Rel dom F

Syntax hints:   /\ wa 104   = wceq 1353   e. wcel 2148   dom cdm 4627   Rel wrel 4632   {coprab 5876   e. cmpo 5877

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 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-14 2151  ax-ext 2159  ax-sep 4122  ax-pow 4175  ax-pr 4210

This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-nf 1461  df-sb 1763  df-eu 2029  df-mo 2030  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-ral 2460  df-rex 2461  df-v 2740  df-un 3134  df-in 3136  df-ss 3143  df-pw 3578  df-sn 3599  df-pr 3600  df-op 3602  df-br 4005  df-opab 4066  df-xp 4633  df-rel 4634  df-dm 4637  df-oprab 5879  df-mpo 5880

This theorem is referenced by:  reldmmap  6657  reldmsets  12491  reldmress  12523  reldmprds  12717