Theorem vscandx

Description: Index value of the df-vsca slot. (Contributed by Mario Carneiro, 14-Aug-2015) (New usage is discouraged.)

	Ref	Expression
Assertion	vscandx	|- ( .s ` ndx ) = 6

Proof

Step	Hyp	Ref	Expression
1		df-vsca	|- .s = Slot 6
2		6nn	|- 6 e. NN
3	1 2	ndxarg	|- ( .s ` ndx ) = 6