Theorem reldmmpo 5964

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 5938	. 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 5858	. . . . 5 |- ( x e. A , y e. B |-> C ) = { <. <. x , y >. , z >. | ( ( x e. A /\ y e. B ) /\ z = C ) }
4	2, 3	eqtri 2191	. . . 4 |- F = { <. <. x , y >. , z >. | ( ( x e. A /\ y e. B ) /\ z = C ) }
5	4	dmeqi 4812	. . 3 |- dom F = dom { <. <. x , y >. , z >. | ( ( x e. A /\ y e. B ) /\ z = C ) }
6	5	releqi 4694	. 2 |- ( Rel dom F <-> Rel dom { <. <. x , y >. , z >. | ( ( x e. A /\ y e. B ) /\ z = C ) } )
7	1, 6	mpbir 145	1 |- Rel dom F

Syntax hints:   /\ wa 103   = wceq 1348   e. wcel 2141   dom cdm 4611   Rel wrel 4616   {coprab 5854   e. cmpo 5855

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-14 2144  ax-ext 2152  ax-sep 4107  ax-pow 4160  ax-pr 4194

This theorem depends on definitions:  df-bi 116  df-3an 975  df-tru 1351  df-nf 1454  df-sb 1756  df-eu 2022  df-mo 2023  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-ral 2453  df-rex 2454  df-v 2732  df-un 3125  df-in 3127  df-ss 3134  df-pw 3568  df-sn 3589  df-pr 3590  df-op 3592  df-br 3990  df-opab 4051  df-xp 4617  df-rel 4618  df-dm 4621  df-oprab 5857  df-mpo 5858

This theorem is referenced by:  reldmmap  6635  reldmsets  12445  reldmress  12476  reldmprds  12605