Theorem plusgid

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

	Ref	Expression
Assertion	plusgid	⊢ +g = Slot ( +g ‘ ndx )

Proof

Step	Hyp	Ref	Expression
1		df-plusg	⊢ +g = Slot 2
2		2nn	⊢ 2 ∈ ℕ
3	1 2	ndxid	⊢ +g = Slot ( +g ‘ ndx )