Theorem cbvopab1vOLD

Description: Obsolete version of cbvopab1v as of 17-Nov-2024. (Contributed by NM, 31-Jul-2003) (Proof shortened by Eric Schmidt, 4-Apr-2007) (Proof modification is discouraged.) (New usage is discouraged.)

	Ref	Expression
Hypothesis	cbvopab1vOLD.1	|- ( x = z -> ( ph <-> ps ) )
Assertion	cbvopab1vOLD	|- { <. x , y >. | ph } = { <. z , y >. | ps }

Proof

Step	Hyp	Ref	Expression
1		cbvopab1vOLD.1	|- ( x = z -> ( ph <-> ps ) )
2		nfv	|- F/ z ph
3		nfv	|- F/ x ps
4	2 3 1	cbvopab1	|- { <. x , y >. | ph } = { <. z , y >. | ps }