Theorem nfra2wOLD

Description: Obsolete version of nfra2w as of 24-Sep-2024. (Contributed by Alan Sare, 31-Dec-2011) (Revised by Gino Giotto, 10-Jan-2024) (Proof modification is discouraged.) (New usage is discouraged.)

	Ref	Expression
Assertion	nfra2wOLD	$$⊢Ⅎy\forall x\in A\forall y\in B\phi$$

Proof

Step	Hyp	Ref	Expression
1		nfcv	$$⊢\underset{\_}{Ⅎ}yA$$
2		nfra1	$$⊢Ⅎy\forall y\in B\phi$$
3	1 2	nfralw	$$⊢Ⅎy\forall x\in A\forall y\in B\phi$$