Theorem copsex2g 4958

Description: Implicit substitution inference for ordered pairs. (Contributed by NM, 28-May-1995.)

Hypothesis

Ref	Expression
copsex2g.1	|- ( ( x = A /\ y = B ) -> ( ph <-> ps ) )

Assertion

Ref	Expression
copsex2g	|- ( ( A e. V /\ B e. W ) -> ( E. x E. y ( <. A , B >. = <. x , y >. /\ ph ) <-> ps ) )

Distinct variable groups:   x, y, ps   x, A, y   x, B, y

Allowed substitution hints:   ph( x, y)   V( x, y)   W( x, y)

Proof of Theorem copsex2g

Step	Hyp	Ref	Expression
1		elisset 3215	. 2 |- ( A e. V -> E. x x = A )
2		elisset 3215	. 2 |- ( B e. W -> E. y y = B )
3		eeanv 2182	. . 3 |- ( E. x E. y ( x = A /\ y = B ) <-> ( E. x x = A /\ E. y y = B ) )
4		nfe1 2027	. . . . 5 |- F/ x E. x E. y ( <. A , B >. = <. x , y >. /\ ph )
5		nfv 1843	. . . . 5 |- F/ x ps
6	4, 5	nfbi 1833	. . . 4 |- F/ x ( E. x E. y ( <. A , B >. = <. x , y >. /\ ph ) <-> ps )
7		nfe1 2027	. . . . . . 7 |- F/ y E. y ( <. A , B >. = <. x , y >. /\ ph )
8	7	nfex 2154	. . . . . 6 |- F/ y E. x E. y ( <. A , B >. = <. x , y >. /\ ph )
9		nfv 1843	. . . . . 6 |- F/ y ps
10	8, 9	nfbi 1833	. . . . 5 |- F/ y ( E. x E. y ( <. A , B >. = <. x , y >. /\ ph ) <-> ps )
11		opeq12 4404	. . . . . . 7 |- ( ( x = A /\ y = B ) -> <. x , y >. = <. A , B >. )
12		copsexg 4956	. . . . . . . 8 |- ( <. A , B >. = <. x , y >. -> ( ph <-> E. x E. y ( <. A , B >. = <. x , y >. /\ ph ) ) )
13	12	eqcoms 2630	. . . . . . 7 |- ( <. x , y >. = <. A , B >. -> ( ph <-> E. x E. y ( <. A , B >. = <. x , y >. /\ ph ) ) )
14	11, 13	syl 17	. . . . . 6 |- ( ( x = A /\ y = B ) -> ( ph <-> E. x E. y ( <. A , B >. = <. x , y >. /\ ph ) ) )
15		copsex2g.1	. . . . . 6 |- ( ( x = A /\ y = B ) -> ( ph <-> ps ) )
16	14, 15	bitr3d 270	. . . . 5 |- ( ( x = A /\ y = B ) -> ( E. x E. y ( <. A , B >. = <. x , y >. /\ ph ) <-> ps ) )
17	10, 16	exlimi 2086	. . . 4 |- ( E. y ( x = A /\ y = B ) -> ( E. x E. y ( <. A , B >. = <. x , y >. /\ ph ) <-> ps ) )
18	6, 17	exlimi 2086	. . 3 |- ( E. x E. y ( x = A /\ y = B ) -> ( E. x E. y ( <. A , B >. = <. x , y >. /\ ph ) <-> ps ) )
19	3, 18	sylbir 225	. 2 |- ( ( E. x x = A /\ E. y y = B ) -> ( E. x E. y ( <. A , B >. = <. x , y >. /\ ph ) <-> ps ) )
20	1, 2, 19	syl2an 494	1 |- ( ( A e. V /\ B e. W ) -> ( E. x E. y ( <. A , B >. = <. x , y >. /\ ph ) <-> ps ) )

Syntax hints:   -> wi 4   <-> wb 196   /\ wa 384   = wceq 1483   E.wex 1704   e. wcel 1990   <.cop 4183

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

This theorem is referenced by:  opelopabga  4988  ov6g  6798  ltresr  9961