Theorem plusgid

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

	Ref	Expression
Assertion	plusgid	$$⊢{+}_{𝑔}=\mathrm{Slot}{+}_{\mathrm{ndx}}$$

Proof

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