Theorem exlimih 1524

Description: Inference from Theorem 19.23 of [Margaris] p. 90. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Andrew Salmon, 13-May-2011.)

Hypotheses

Ref	Expression
exlimih.1	|- ( ps -> A. x ps )
exlimih.2	|- ( ph -> ps )

Assertion

Ref	Expression
exlimih	|- ( E. x ph -> ps )

Proof of Theorem exlimih

Step	Hyp	Ref	Expression
1		exlimih.1	. . 3 |- ( ps -> A. x ps )
2	1	19.23h 1427	. 2 |- ( A. x ( ph -> ps ) <-> ( E. x ph -> ps ) )
3		exlimih.2	. 2 |- ( ph -> ps )
4	2, 3	mpgbi 1381	1 |- ( E. x ph -> ps )

Syntax hints:   -> wi 4   A.wal 1282   E.wex 1421

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-gen 1378  ax-ie2 1423

This theorem depends on definitions:  df-bi 115

This theorem is referenced by:  exlimi  1525  exlimiv  1529  19.43  1559  hbex  1567  ax6blem  1580  19.41h  1615  ax9o  1628  equid  1629  equsex  1656  cbvexh  1678  equs5a  1715  sb5rf  1773  equvin  1784  euan  1997  moexexdc  2025