Theorem 19.2g

Description: Theorem 19.2 of Margaris p. 89, generalized to use two setvar variables. Use 19.2 when sufficient. (Contributed by Mel L. O'Cat, 31-Mar-2008)

	Ref	Expression
Assertion	19.2g	|- ( A. x ph -> E. y ph )

Proof

Step	Hyp	Ref	Expression
1		19.8a	|- ( ph -> E. y ph )
2	1	sps	|- ( A. x ph -> E. y ph )