Theorem 19.40 1631

Description: Theorem 19.40 of [Margaris] p. 90. (Contributed by NM, 5-Aug-1993.)

Assertion

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

Proof of Theorem 19.40

Step	Hyp	Ref	Expression
1		exsimpl 1617	. 2 |- ( E. x ( ph /\ ps ) -> E. x ph )
2		simpr 110	. . 3 |- ( ( ph /\ ps ) -> ps )
3	2	eximi 1600	. 2 |- ( E. x ( ph /\ ps ) -> E. x ps )
4	1, 3	jca 306	1 |- ( E. x ( ph /\ ps ) -> ( E. x ph /\ E. x ps ) )

Syntax hints:   -> wi 4   /\ wa 104   E.wex 1492

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 1447  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-4 1510  ax-ial 1534

This theorem depends on definitions:  df-bi 117

This theorem is referenced by:  19.40-2  1632  19.41h  1685  19.41  1686  exdistrfor  1800  uniin  3829  copsexg  4243  dmin  4834  imadif  5295  imainlem  5296