Theorem eximii

Description: Inference associated with eximi . (Contributed by BJ, 3-Feb-2018)

	Ref	Expression
Hypotheses	eximii.1	$$⊢\exists x\phi$$
	eximii.2	$$⊢\phi \to \psi$$
Assertion	eximii	$$⊢\exists x\psi$$

Proof

Step	Hyp	Ref	Expression
1		eximii.1	$$⊢\exists x\phi$$
2		eximii.2	$$⊢\phi \to \psi$$
3	2	eximi	$$⊢\exists x\phi \to \exists x\psi$$
4	1 3	ax-mp	$$⊢\exists x\psi$$