Theorem sbcbidvOLD

Description: Obsolete version of sbcbidv as of 1-Dec-2023. (Contributed by NM, 29-Dec-2014) (Proof modification is discouraged.) (New usage is discouraged.)

	Ref	Expression
Hypothesis	sbcbidv.1	|- ( ph -> ( ps <-> ch ) )
Assertion	sbcbidvOLD	|- ( ph -> ( [. A / x ]. ps <-> [. A / x ]. ch ) )

Proof

Step	Hyp	Ref	Expression
1		sbcbidv.1	|- ( ph -> ( ps <-> ch ) )
2		nfv	|- F/ x ph
3	2 1	sbcbid	|- ( ph -> ( [. A / x ]. ps <-> [. A / x ]. ch ) )