Theorem dmoprab 6741

Description: The domain of an operation class abstraction. (Contributed by NM, 17-Mar-1995.) (Revised by David Abernethy, 19-Jun-2012.)

Assertion

Ref	Expression
dmoprab	|- dom { <. <. x , y >. , z >. | ph } = { <. x , y >. | E. z ph }

Distinct variable groups:   x, z   y, z

Allowed substitution hints:   ph( x, y, z)

Proof of Theorem dmoprab

Dummy variable w is distinct from all other variables.

Step	Hyp	Ref	Expression
1		dfoprab2 6701	. . 3 |- { <. <. x , y >. , z >. | ph } = { <. w , z >. | E. x E. y ( w = <. x , y >. /\ ph ) }
2	1	dmeqi 5325	. 2 |- dom { <. <. x , y >. , z >. | ph } = dom { <. w , z >. | E. x E. y ( w = <. x , y >. /\ ph ) }
3		dmopab 5335	. 2 |- dom { <. w , z >. | E. x E. y ( w = <. x , y >. /\ ph ) } = { w | E. z E. x E. y ( w = <. x , y >. /\ ph ) }
4		exrot3 2045	. . . . 5 |- ( E. z E. x E. y ( w = <. x , y >. /\ ph ) <-> E. x E. y E. z ( w = <. x , y >. /\ ph ) )
5		19.42v 1918	. . . . . 6 |- ( E. z ( w = <. x , y >. /\ ph ) <-> ( w = <. x , y >. /\ E. z ph ) )
6	5	2exbii 1775	. . . . 5 |- ( E. x E. y E. z ( w = <. x , y >. /\ ph ) <-> E. x E. y ( w = <. x , y >. /\ E. z ph ) )
7	4, 6	bitri 264	. . . 4 |- ( E. z E. x E. y ( w = <. x , y >. /\ ph ) <-> E. x E. y ( w = <. x , y >. /\ E. z ph ) )
8	7	abbii 2739	. . 3 |- { w | E. z E. x E. y ( w = <. x , y >. /\ ph ) } = { w | E. x E. y ( w = <. x , y >. /\ E. z ph ) }
9		df-opab 4713	. . 3 |- { <. x , y >. | E. z ph } = { w | E. x E. y ( w = <. x , y >. /\ E. z ph ) }
10	8, 9	eqtr4i 2647	. 2 |- { w | E. z E. x E. y ( w = <. x , y >. /\ ph ) } = { <. x , y >. | E. z ph }
11	2, 3, 10	3eqtri 2648	1 |- dom { <. <. x , y >. , z >. | ph } = { <. x , y >. | E. z ph }

Syntax hints:   /\ wa 384   = wceq 1483   E.wex 1704   {cab 2608   <.cop 4183   {copab 4712   dom cdm 5114   {coprab 6651

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pr 4906

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-rab 2921  df-v 3202  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-sn 4178  df-pr 4180  df-op 4184  df-br 4654  df-opab 4713  df-dm 5124  df-oprab 6654

This theorem is referenced by:  dmoprabss  6742  reldmoprab  6745  fnoprabg  6761  1st2val  7194  2nd2val  7195  joindm  17003  meetdm  17017  dmscut  31918  linedegen  32250