Theorem elv

Description: If a proposition is implied by x e. _V (which is true, see vex ), then it is true. (Contributed by Peter Mazsa, 13-Oct-2018)

	Ref	Expression
Hypothesis	elv.1	|- ( x e. _V -> ph )
Assertion	elv	|- ph

Proof

Step	Hyp	Ref	Expression
1		elv.1	|- ( x e. _V -> ph )
2		vex	|- x e. _V
3	2 1	ax-mp	|- ph