Theorem vtoclgOLD

Description: Obsolete version of vtoclg as of 20-Apr-2024. (Contributed by NM, 17-Apr-1995) (New usage is discouraged.) (Proof modification is discouraged.)

	Ref	Expression
Hypotheses	vtoclgOLD.1	|- ( x = A -> ( ph <-> ps ) )
	vtoclgOLD.2	|- ph
Assertion	vtoclgOLD	|- ( A e. V -> ps )

Proof

Step	Hyp	Ref	Expression
1		vtoclgOLD.1	|- ( x = A -> ( ph <-> ps ) )
2		vtoclgOLD.2	|- ph
3		nfv	|- F/ x ps
4	3 1 2	vtoclg1f	|- ( A e. V -> ps )