Theorem optocl 5195

Description: Implicit substitution of class for ordered pair. (Contributed by NM, 5-Mar-1995.)

Hypotheses

Ref	Expression
optocl.1	|- D = ( B X. C )
optocl.2	|- ( <. x , y >. = A -> ( ph <-> ps ) )
optocl.3	|- ( ( x e. B /\ y e. C ) -> ph )

Assertion

Ref	Expression
optocl	|- ( A e. D -> ps )

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

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

Proof of Theorem optocl

Step	Hyp	Ref	Expression
1		elxp3 5169	. . 3 |- ( A e. ( B X. C ) <-> E. x E. y ( <. x , y >. = A /\ <. x , y >. e. ( B X. C ) ) )
2		opelxp 5146	. . . . . . 7 |- ( <. x , y >. e. ( B X. C ) <-> ( x e. B /\ y e. C ) )
3		optocl.3	. . . . . . 7 |- ( ( x e. B /\ y e. C ) -> ph )
4	2, 3	sylbi 207	. . . . . 6 |- ( <. x , y >. e. ( B X. C ) -> ph )
5		optocl.2	. . . . . 6 |- ( <. x , y >. = A -> ( ph <-> ps ) )
6	4, 5	syl5ib 234	. . . . 5 |- ( <. x , y >. = A -> ( <. x , y >. e. ( B X. C ) -> ps ) )
7	6	imp 445	. . . 4 |- ( ( <. x , y >. = A /\ <. x , y >. e. ( B X. C ) ) -> ps )
8	7	exlimivv 1860	. . 3 |- ( E. x E. y ( <. x , y >. = A /\ <. x , y >. e. ( B X. C ) ) -> ps )
9	1, 8	sylbi 207	. 2 |- ( A e. ( B X. C ) -> ps )
10		optocl.1	. 2 |- D = ( B X. C )
11	9, 10	eleq2s 2719	1 |- ( A e. D -> ps )

Syntax hints:   -> wi 4   <-> wb 196   /\ wa 384   = wceq 1483   E.wex 1704   e. wcel 1990   <.cop 4183   X. cxp 5112

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-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ral 2917  df-rex 2918  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-opab 4713  df-xp 5120

This theorem is referenced by:  2optocl  5196  3optocl  5197  ecoptocl  7837  ax1rid  9982  axcnre  9985