Theorem csbconstg

Description: Substitution doesn't affect a constant B (in which x does not occur). csbconstgf with distinct variable requirement. (Contributed by Alan Sare, 22-Jul-2012)

	Ref	Expression
Assertion	csbconstg	|- ( A e. V -> [_ A / x ]_ B = B )

Proof

Step	Hyp	Ref	Expression
1		nfcv	|- F/_ x B
2	1	csbconstgf	|- ( A e. V -> [_ A / x ]_ B = B )