Theorem bj-19.23bit

Description: Closed form of 19.23bi . (Contributed by BJ, 20-Oct-2019)

	Ref	Expression
Assertion	bj-19.23bit	|- ( ( E. x ph -> ps ) -> ( ph -> ps ) )

Proof

Step	Hyp	Ref	Expression
1		19.8a	|- ( ph -> E. x ph )
2	1	imim1i	|- ( ( E. x ph -> ps ) -> ( ph -> ps ) )