Theorem ipndx

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

	Ref	Expression
Assertion	ipndx	⊢ ( ·𝑖 ‘ ndx ) = 8

Proof

Step	Hyp	Ref	Expression
1		df-ip	⊢ ·𝑖 = Slot 8
2		8nn	⊢ 8 ∈ ℕ
3	1 2	ndxarg	⊢ ( ·𝑖 ‘ ndx ) = 8