Theorem 19.37iv

Description: Inference associated with 19.37v . (Contributed by NM, 5-Aug-1993) Remove dependency on ax-6 . (Revised by Rohan Ridenour, 15-Apr-2022)

	Ref	Expression
Hypothesis	19.37iv.1	|- E. x ( ph -> ps )
Assertion	19.37iv	|- ( ph -> E. x ps )

Proof

Step	Hyp	Ref	Expression
1		19.37iv.1	|- E. x ( ph -> ps )
2		19.37imv	|- ( E. x ( ph -> ps ) -> ( ph -> E. x ps ) )
3	1 2	ax-mp	|- ( ph -> E. x ps )