Theorem r19.37vOLD

Description: Obsolete version of r19.37v as of 18-Jun-2023. (Contributed by NM, 2-Apr-2004) (Proof modification is discouraged.) (New usage is discouraged.)

	Ref	Expression
Assertion	r19.37vOLD	$$⊢\exists x\in A\left(\phi \to \psi \right)\to \left(\phi \to \exists x\in A\psi \right)$$

Proof

Step	Hyp	Ref	Expression
1		nfv	$$⊢Ⅎx\phi$$
2	1	r19.37	$$⊢\exists x\in A\left(\phi \to \psi \right)\to \left(\phi \to \exists x\in A\psi \right)$$