Theorem 19.29 1618

Description: Theorem 19.29 of [Margaris] p. 90. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Andrew Salmon, 13-May-2011.)

Assertion

Ref	Expression
19.29	|- ( ( A. x ph /\ E. x ps ) -> E. x ( ph /\ ps ) )

Proof of Theorem 19.29

Step	Hyp	Ref	Expression
1		pm3.2 139	. . . 4 |- ( ph -> ( ps -> ( ph /\ ps ) ) )
2	1	alimi 1453	. . 3 |- ( A. x ph -> A. x ( ps -> ( ph /\ ps ) ) )
3		exim 1597	. . 3 |- ( A. x ( ps -> ( ph /\ ps ) ) -> ( E. x ps -> E. x ( ph /\ ps ) ) )
4	2, 3	syl 14	. 2 |- ( A. x ph -> ( E. x ps -> E. x ( ph /\ ps ) ) )
5	4	imp 124	1 |- ( ( A. x ph /\ E. x ps ) -> E. x ( ph /\ ps ) )

Syntax hints:   -> wi 4   /\ wa 104   A.wal 1351   E.wex 1490

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 1445  ax-gen 1447  ax-ie1 1491  ax-ie2 1492  ax-4 1508  ax-ial 1532

This theorem depends on definitions:  df-bi 117

This theorem is referenced by:  19.29r  1619  19.29x  1621  19.35-1  1622  equs4  1723  equvini  1756  rexxfrd  4457  funimaexglem  5291  bj-inex  14199