Theorem 2optocl 4437

Description: Implicit substitution of classes for ordered pairs. (Contributed by NM, 12-Mar-1995.)

Hypotheses

Ref	Expression
2optocl.1	|- R = ( C X. D )
2optocl.2	|- ( <. x , y >. = A -> ( ph <-> ps ) )
2optocl.3	|- ( <. z , w >. = B -> ( ps <-> ch ) )
2optocl.4	|- ( ( ( x e. C /\ y e. D ) /\ ( z e. C /\ w e. D ) ) -> ph )

Assertion

Ref	Expression
2optocl	|- ( ( A e. R /\ B e. R ) -> ch )

Distinct variable groups:   x, y, z, w, A   z, B, w   x, C, y, z, w   x, D, y, z, w   ps, x, y   ch, z, w   z, R, w

Allowed substitution hints:   ph( x, y, z, w)   ps( z, w)   ch( x, y)   B( x, y)   R( x, y)

Proof of Theorem 2optocl

Step	Hyp	Ref	Expression
1		2optocl.1	. . 3 |- R = ( C X. D )
2		2optocl.3	. . . 4 |- ( <. z , w >. = B -> ( ps <-> ch ) )
3	2	imbi2d 228	. . 3 |- ( <. z , w >. = B -> ( ( A e. R -> ps ) <-> ( A e. R -> ch ) ) )
4		2optocl.2	. . . . . 6 |- ( <. x , y >. = A -> ( ph <-> ps ) )
5	4	imbi2d 228	. . . . 5 |- ( <. x , y >. = A -> ( ( ( z e. C /\ w e. D ) -> ph ) <-> ( ( z e. C /\ w e. D ) -> ps ) ) )
6		2optocl.4	. . . . . 6 |- ( ( ( x e. C /\ y e. D ) /\ ( z e. C /\ w e. D ) ) -> ph )
7	6	ex 113	. . . . 5 |- ( ( x e. C /\ y e. D ) -> ( ( z e. C /\ w e. D ) -> ph ) )
8	1, 5, 7	optocl 4436	. . . 4 |- ( A e. R -> ( ( z e. C /\ w e. D ) -> ps ) )
9	8	com12 30	. . 3 |- ( ( z e. C /\ w e. D ) -> ( A e. R -> ps ) )
10	1, 3, 9	optocl 4436	. 2 |- ( B e. R -> ( A e. R -> ch ) )
11	10	impcom 123	1 |- ( ( A e. R /\ B e. R ) -> ch )

Syntax hints:   -> wi 4   /\ wa 102   <-> wb 103   = wceq 1285   e. wcel 1434   <.cop 3403   X. cxp 4363

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-io 663  ax-5 1377  ax-7 1378  ax-gen 1379  ax-ie1 1423  ax-ie2 1424  ax-8 1436  ax-10 1437  ax-11 1438  ax-i12 1439  ax-bndl 1440  ax-4 1441  ax-14 1446  ax-17 1460  ax-i9 1464  ax-ial 1468  ax-i5r 1469  ax-ext 2064  ax-sep 3898  ax-pow 3950  ax-pr 3966

This theorem depends on definitions:  df-bi 115  df-3an 922  df-tru 1288  df-nf 1391  df-sb 1687  df-clab 2069  df-cleq 2075  df-clel 2078  df-nfc 2209  df-ral 2354  df-rex 2355  df-v 2604  df-un 2978  df-in 2980  df-ss 2987  df-pw 3386  df-sn 3406  df-pr 3407  df-op 3409  df-opab 3842  df-xp 4371

This theorem is referenced by:  3optocl  4438  ecopovsym  6261  ecopovsymg  6264  th3qlem2  6268  axaddcom  7087