Theorem eximdh 1590

Description: Deduction from Theorem 19.22 of [Margaris] p. 90. (Contributed by NM, 20-May-1996.)

Hypotheses

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

Assertion

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

Proof of Theorem eximdh

Step	Hyp	Ref	Expression
1		eximdh.1	. . 3 |- ( ph -> A. x ph )
2		eximdh.2	. . 3 |- ( ph -> ( ps -> ch ) )
3	1, 2	alrimih 1445	. 2 |- ( ph -> A. x ( ps -> ch ) )
4		exim 1578	. 2 |- ( A. x ( ps -> ch ) -> ( E. x ps -> E. x ch ) )
5	3, 4	syl 14	1 |- ( ph -> ( E. x ps -> E. x ch ) )

Syntax hints:   -> wi 4   A.wal 1329   E.wex 1468

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 1423  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-4 1487  ax-ial 1514

This theorem depends on definitions:  df-bi 116

This theorem is referenced by:  eximd  1591  19.41h  1663  hbexd  1672  equsex  1706  equsexd  1707  spimeh  1717  sbiedh  1760  exdistrfor  1772  eximdv  1852  cbvexdh  1898  mopick2  2082  2euex  2086  bj-sbimedh  12978