Theorem 19.35i

Description: Inference associated with 19.35 . (Contributed by NM, 21-Jun-1993)

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

Proof

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