Theorem 19.35ri

Description: Inference associated with 19.35 . (Contributed by NM, 12-Mar-1993)

	Ref	Expression
Hypothesis	19.35ri.1	|- ( A. x ph -> E. x ps )
Assertion	19.35ri	|- E. x ( ph -> ps )

Proof

Step	Hyp	Ref	Expression
1		19.35ri.1	|- ( A. x ph -> E. x ps )
2		19.35	|- ( E. x ( ph -> ps ) <-> ( A. x ph -> E. x ps ) )
3	1 2	mpbir	|- E. x ( ph -> ps )