Theorem alim

Description: Restatement of Axiom ax-4 , for labeling consistency. It should be the only theorem using ax-4 . (Contributed by NM, 10-Jan-1993)

	Ref	Expression
Assertion	alim	$$⊢\forall x\left(\phi \to \psi \right)\to \left(\forall x\phi \to \forall x\psi \right)$$

Proof

Step	Hyp	Ref	Expression
1		ax-4	$$⊢\forall x\left(\phi \to \psi \right)\to \left(\forall x\phi \to \forall x\psi \right)$$