Theorem reximdvai 2557

Description: Deduction quantifying both antecedent and consequent, based on Theorem 19.22 of [Margaris] p. 90. (Contributed by NM, 14-Nov-2002.)

Hypothesis

Ref	Expression
reximdvai.1	|- ( ph -> ( x e. A -> ( ps -> ch ) ) )

Assertion

Ref	Expression
reximdvai	|- ( ph -> ( E. x e. A ps -> E. x e. A ch ) )

Distinct variable group:   ph, x

Allowed substitution hints:   ps( x)   ch( x)   A( x)

Proof of Theorem reximdvai

Step	Hyp	Ref	Expression
1		nfv 1508	. 2 |- F/ x ph
2		reximdvai.1	. 2 |- ( ph -> ( x e. A -> ( ps -> ch ) ) )
3	1, 2	reximdai 2555	1 |- ( ph -> ( E. x e. A ps -> E. x e. A ch ) )

Syntax hints:   -> wi 4   e. wcel 2128   E.wrex 2436

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-5 1427  ax-gen 1429  ax-ie1 1473  ax-ie2 1474  ax-4 1490  ax-17 1506  ax-ial 1514

This theorem depends on definitions:  df-bi 116  df-nf 1441  df-ral 2440  df-rex 2441

This theorem is referenced by:  reximdv  2558  reximdva  2559  reuind  2917