Theorem baseid

Description: Utility theorem: index-independent form of df-base . (Contributed by NM, 20-Oct-2012)

	Ref	Expression
Assertion	baseid	$$⊢\mathrm{Base}=\mathrm{Slot}{\mathrm{Base}}_{\mathrm{ndx}}$$

Proof

Step	Hyp	Ref	Expression
1		df-base	$$⊢\mathrm{Base}=\mathrm{Slot}1$$
2		1nn	$$⊢1\in \mathbb{N}$$
3	1 2	ndxid	$$⊢\mathrm{Base}=\mathrm{Slot}{\mathrm{Base}}_{\mathrm{ndx}}$$