Theorem eximdh 1621

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 1479	. 2 |- ( ph -> A. x ( ps -> ch ) )
4		exim 1609	. 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 1361   E.wex 1502

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 1457  ax-gen 1459  ax-ie1 1503  ax-ie2 1504  ax-4 1520  ax-ial 1544

This theorem depends on definitions:  df-bi 117

This theorem is referenced by:  eximd  1622  19.41h  1695  hbexd  1704  equsex  1738  equsexd  1739  spimeh  1749  sbiedh  1797  exdistrfor  1810  eximdv  1890  cbvexdh  1936  mopick2  2119  2euex  2123  bj-sbimedh  14819