Theorem reldmmpt2 5612

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
reldmmpt2	|- 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 reldmmpt2

Dummy variable z is distinct from all other variables.

Step	Hyp	Ref	Expression
1		reldmoprab 5589	. 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-mpt2 5517	. . . . 5 |- ( x e. A , y e. B |-> C ) = { <. <. x , y >. , z >. | ( ( x e. A /\ y e. B ) /\ z = C ) }
4	2, 3	eqtri 2060	. . . 4 |- F = { <. <. x , y >. , z >. | ( ( x e. A /\ y e. B ) /\ z = C ) }
5	4	dmeqi 4536	. . 3 |- dom F = dom { <. <. x , y >. , z >. | ( ( x e. A /\ y e. B ) /\ z = C ) }
6	5	releqi 4423	. 2 |- ( Rel dom F <-> Rel dom { <. <. x , y >. , z >. | ( ( x e. A /\ y e. B ) /\ z = C ) } )
7	1, 6	mpbir 134	1 |- Rel dom F

Syntax hints:   /\ wa 97   = wceq 1243   e. wcel 1393   dom cdm 4345   Rel wrel 4350   {coprab 5513   |-> cmpt2 5514

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 630  ax-5 1336  ax-7 1337  ax-gen 1338  ax-ie1 1382  ax-ie2 1383  ax-8 1395  ax-10 1396  ax-11 1397  ax-i12 1398  ax-bndl 1399  ax-4 1400  ax-14 1405  ax-17 1419  ax-i9 1423  ax-ial 1427  ax-i5r 1428  ax-ext 2022  ax-sep 3875  ax-pow 3927  ax-pr 3944

This theorem depends on definitions:  df-bi 110  df-3an 887  df-tru 1246  df-nf 1350  df-sb 1646  df-eu 1903  df-mo 1904  df-clab 2027  df-cleq 2033  df-clel 2036  df-nfc 2167  df-ral 2311  df-rex 2312  df-v 2559  df-un 2922  df-in 2924  df-ss 2931  df-pw 3361  df-sn 3381  df-pr 3382  df-op 3384  df-br 3765  df-opab 3819  df-xp 4351  df-rel 4352  df-dm 4355  df-oprab 5516  df-mpt2 5517

This theorem is referenced by: (None)