Theorem 19.36imvOLD

Description: Obsolete version of 19.36imv as of 22-Sep-2024. (Contributed by Rohan Ridenour, 16-Apr-2022) (Proof modification is discouraged.) (New usage is discouraged.)

	Ref	Expression
Assertion	19.36imvOLD	|- ( E. x ( ph -> ps ) -> ( A. x ph -> ps ) )

Proof

Step	Hyp	Ref	Expression
1		19.35	|- ( E. x ( ph -> ps ) <-> ( A. x ph -> E. x ps ) )
2	1	biimpi	|- ( E. x ( ph -> ps ) -> ( A. x ph -> E. x ps ) )
3		ax5e	|- ( E. x ps -> ps )
4	2 3	syl6	|- ( E. x ( ph -> ps ) -> ( A. x ph -> ps ) )