Theorem nfcriOLDOLDOLD

Description: Obsolete version of nfcri as of 23-May-2024. (Contributed by Mario Carneiro, 11-Aug-2016) (Proof modification is discouraged.) (New usage is discouraged.)

	Ref	Expression
Hypothesis	nfcriOLD.1	|- F/_ x A
Assertion	nfcriOLDOLDOLD	|- F/ x y e. A

Proof

Step	Hyp	Ref	Expression
1		nfcriOLD.1	|- F/_ x A
2	1	nfcrii	|- ( y e. A -> A. x y e. A )
3	2	nf5i	|- F/ x y e. A