Theorem csbieOLD

Description: Obsolete version of csbie as of 15-Oct-2024. (Contributed by AV, 2-Dec-2019) (Proof modification is discouraged.) (New usage is discouraged.)

	Ref	Expression
Hypotheses	csbieOLD.1	|- A e. _V
	csbieOLD.2	|- ( x = A -> B = C )
Assertion	csbieOLD	|- [_ A / x ]_ B = C

Proof

Step	Hyp	Ref	Expression
1		csbieOLD.1	|- A e. _V
2		csbieOLD.2	|- ( x = A -> B = C )
3		nfcv	|- F/_ x C
4	1 3 2	csbief	|- [_ A / x ]_ B = C