Theorem 2ax5

Description: Quantification of two variables over a formula in which they do not occur. (Contributed by Alan Sare, 12-Apr-2011)

	Ref	Expression
Assertion	2ax5	$$⊢\phi \to \forall x\forall y\phi$$

Proof

Step	Hyp	Ref	Expression
1		id	$$⊢\phi \to \phi$$
2	1	alrimivv	$$⊢\phi \to \forall x\forall y\phi$$