Theorem rspc2ev 2964

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 2956	. . . 4 |- ((B e. D /\ ps) -> E.y e. D ch)
3	2	anim2i 552	. . 3 |- ((A e. C /\ (B e. D /\ ps)) -> (A e. C /\ E.y e. D ch))
4	3	3impb 1147	. 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 2636	. . 3 |- (x = A -> (E.y e. D ph <-> E.y e. D ch))
7	6	rspcev 2956	. 2 |- ((A e. C /\ E.y e. D ch) -> E.x e. C E.y e. D ph)
8	4, 7	syl 15	1 |- ((A e. C /\ B e. D /\ ps) -> E.x e. C E.y e. D ph)

Syntax hints:   -> wi 4   <-> wb 176   /\ wa 358   /\ w3a 934   = wceq 1642   e. wcel 1710  E.wrex 2616

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334

This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3an 936  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2479  df-rex 2621  df-v 2862

This theorem is referenced by:  rspc3ev  2966  eladdci  4400  rspceov  5557  nclec  6196  ltcpw1pwg  6203  nc0le1  6217  nclenc  6223  ce2le  6234  tlenc1c  6241