Theorem bnj937

Description: First-order logic and set theory. (Contributed by Jonathan Ben-Naim, 3-Jun-2011) (New usage is discouraged.)

	Ref	Expression
Hypothesis	bnj937.1	|- ( ph -> E. x ps )
Assertion	bnj937	|- ( ph -> ps )

Proof

Step	Hyp	Ref	Expression
1		bnj937.1	|- ( ph -> E. x ps )
2		19.9v	|- ( E. x ps <-> ps )
3	1 2	sylib	|- ( ph -> ps )