Theorem exlimivv

Description: Inference form of Theorem 19.23 of Margaris p. 90, see 19.23 . (Contributed by NM, 1-Aug-1995)

	Ref	Expression
Hypothesis	exlimivv.1	$$⊢\phi \to \psi$$
Assertion	exlimivv	$$⊢\exists x\exists y\phi \to \psi$$

Proof

Step	Hyp	Ref	Expression
1		exlimivv.1	$$⊢\phi \to \psi$$
2	1	exlimiv	$$⊢\exists y\phi \to \psi$$
3	2	exlimiv	$$⊢\exists x\exists y\phi \to \psi$$