Theorem reximdai 2603

Description: Deduction from Theorem 19.22 of [Margaris] p. 90. (Restricted quantifier version.) (Contributed by NM, 31-Aug-1999.)

Hypotheses

Ref	Expression
reximdai.1	|- F/ x ph
reximdai.2	|- ( ph -> ( x e. A -> ( ps -> ch ) ) )

Assertion

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

Proof of Theorem reximdai

Step	Hyp	Ref	Expression
1		reximdai.1	. . 3 |- F/ x ph
2		reximdai.2	. . 3 |- ( ph -> ( x e. A -> ( ps -> ch ) ) )
3	1, 2	ralrimi 2576	. 2 |- ( ph -> A. x e. A ( ps -> ch ) )
4		rexim 2599	. 2 |- ( A. x e. A ( ps -> ch ) -> ( E. x e. A ps -> E. x e. A ch ) )
5	3, 4	syl 14	1 |- ( ph -> ( E. x e. A ps -> E. x e. A ch ) )

Syntax hints:   -> wi 4   F/wnf 1482   e. wcel 2175   A.wral 2483   E.wrex 2484

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-5 1469  ax-gen 1471  ax-ie1 1515  ax-ie2 1516  ax-4 1532  ax-ial 1556

This theorem depends on definitions:  df-bi 117  df-nf 1483  df-ral 2488  df-rex 2489

This theorem is referenced by:  reximdvai  2605  bezoutlemstep  12289  isomninnlem  15931  ismkvnnlem  15953