Theorem bj-2exim

Description: Closed form of 2eximi . (Contributed by BJ, 6-May-2019)

	Ref	Expression
Assertion	bj-2exim	|- ( A. x A. y ( ph -> ps ) -> ( E. x E. y ph -> E. x E. y ps ) )

Proof

Step	Hyp	Ref	Expression
1		exim	|- ( A. y ( ph -> ps ) -> ( E. y ph -> E. y ps ) )
2	1	aleximi	|- ( A. x A. y ( ph -> ps ) -> ( E. x E. y ph -> E. x E. y ps ) )