Theorem starvndx

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

	Ref	Expression
Assertion	starvndx	⊢ ( *𝑟 ‘ ndx ) = 4

Proof

Step	Hyp	Ref	Expression
1		df-starv	⊢ *𝑟 = Slot 4
2		4nn	⊢ 4 ∈ ℕ
3	1 2	ndxarg	⊢ ( *𝑟 ‘ ndx ) = 4