fv-exy

Theorem.

Arguments:

(sv), (sv), (pr),

Hypotheses:

()

Assertions:

()

Proof:

Hyp	Ref	Line	Expr
	Hypo	1	()
1	fv-neg	2	()
2	fv-aly	3	()
3	fv-neg	4	()
	df-ex	5	()
5	eqt-∀-i	6	()
4, 5, 6	<imtr	7	()