Theorem scaid

Description: Utility theorem: index-independent form of scalar df-sca . (Contributed by Mario Carneiro, 19-Jun-2014)

	Ref	Expression
Assertion	scaid	$$⊢\mathrm{Scalar}=\mathrm{Slot}\mathrm{Scalar}\left(\mathrm{ndx}\right)$$

Proof

Step	Hyp	Ref	Expression
1		df-sca	$$⊢\mathrm{Scalar}=\mathrm{Slot}5$$
2		5nn	$$⊢5\in \mathbb{N}$$
3	1 2	ndxid	$$⊢\mathrm{Scalar}=\mathrm{Slot}\mathrm{Scalar}\left(\mathrm{ndx}\right)$$