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	$$⊢{\cdot }_{𝑖}\left(\mathrm{ndx}\right)=8$$

Proof

Step	Hyp	Ref	Expression
1		df-ip	$$⊢{\cdot }_{𝑖}=\mathrm{Slot}8$$
2		8nn	$$⊢8\in \mathbb{N}$$
3	1 2	ndxarg	$$⊢{\cdot }_{𝑖}\left(\mathrm{ndx}\right)=8$$