Theorem cbviotavwOLD

Description: Obsolete version of cbviotavw as of 30-Sep-2024. (Contributed by Andrew Salmon, 1-Aug-2011) (Revised by Gino Giotto, 26-Jan-2024) (Proof modification is discouraged.) (New usage is discouraged.)

	Ref	Expression
Hypothesis	cbviotavwOLD.1	|- ( x = y -> ( ph <-> ps ) )
Assertion	cbviotavwOLD	|- ( iota x ph ) = ( iota y ps )

Proof

Step	Hyp	Ref	Expression
1		cbviotavwOLD.1	|- ( x = y -> ( ph <-> ps ) )
2		nfv	|- F/ y ph
3		nfv	|- F/ x ps
4	1 2 3	cbviotaw	|- ( iota x ph ) = ( iota y ps )