Theorem rspc2ev 2715

Description: 2-variable restricted existential specialization, using implicit substitution. (Contributed by NM, 16-Oct-1999.)

Hypotheses

Ref	Expression
rspc2v.1	|- ( x = A -> ( ph <-> ch ) )
rspc2v.2	|- ( y = B -> ( ch <-> ps ) )

Assertion

Ref	Expression
rspc2ev	|- ( ( A e. C /\ B e. D /\ ps ) -> E. x e. C E. y e. D ph )

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

Allowed substitution hints:   ph( x, y)   ps( x)   ch( y)   B( x)   C( y)

Proof of Theorem rspc2ev

Step	Hyp	Ref	Expression
1		rspc2v.2	. . . . 5 |- ( y = B -> ( ch <-> ps ) )
2	1	rspcev 2701	. . . 4 |- ( ( B e. D /\ ps ) -> E. y e. D ch )
3	2	anim2i 334	. . 3 |- ( ( A e. C /\ ( B e. D /\ ps ) ) -> ( A e. C /\ E. y e. D ch ) )
4	3	3impb 1134	. 2 |- ( ( A e. C /\ B e. D /\ ps ) -> ( A e. C /\ E. y e. D ch ) )
5		rspc2v.1	. . . 4 |- ( x = A -> ( ph <-> ch ) )
6	5	rexbidv 2369	. . 3 |- ( x = A -> ( E. y e. D ph <-> E. y e. D ch ) )
7	6	rspcev 2701	. 2 |- ( ( A e. C /\ E. y e. D ch ) -> E. x e. C E. y e. D ph )
8	4, 7	syl 14	1 |- ( ( A e. C /\ B e. D /\ ps ) -> E. x e. C E. y e. D ph )

Syntax hints:   -> wi 4   /\ wa 102   <-> wb 103   /\ w3a 919   = wceq 1284   e. wcel 1433   E.wrex 2349

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 662  ax-5 1376  ax-7 1377  ax-gen 1378  ax-ie1 1422  ax-ie2 1423  ax-8 1435  ax-10 1436  ax-11 1437  ax-i12 1438  ax-bndl 1439  ax-4 1440  ax-17 1459  ax-i9 1463  ax-ial 1467  ax-i5r 1468  ax-ext 2063

This theorem depends on definitions:  df-bi 115  df-3an 921  df-tru 1287  df-nf 1390  df-sb 1686  df-clab 2068  df-cleq 2074  df-clel 2077  df-nfc 2208  df-rex 2354  df-v 2603

This theorem is referenced by:  rspc3ev  2717  opelxp  4392  rspceov  5567  2dom  6308  apreim  7703  addcn2  10149  mulcn2  10151  divalglemnn  10318  bezoutlema  10388  bezoutlemb  10389