Theorem exlimih 1581

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 1486	. 2 |- ( A. x ( ph -> ps ) <-> ( E. x ph -> ps ) )
3		exlimih.2	. 2 |- ( ph -> ps )
4	2, 3	mpgbi 1440	1 |- ( E. x ph -> ps )

Syntax hints:   -> wi 4   A.wal 1341   E.wex 1480

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-gen 1437  ax-ie2 1482

This theorem depends on definitions:  df-bi 116

This theorem is referenced by:  exlimi  1582  exlimiv  1586  19.43  1616  hbex  1624  ax6blem  1638  19.41h  1673  ax9o  1686  equid  1689  equsex  1716  cbvexh  1743  equs5a  1782  sb5rf  1840  equvin  1851  euan  2070  moexexdc  2098