Theorem plendx

Description: Index value of the df-ple slot. (Contributed by Mario Carneiro, 14-Aug-2015) (Revised by AV, 9-Sep-2021) (New usage is discouraged.)

	Ref	Expression
Assertion	plendx	$$⊢{\le }_{\mathrm{ndx}}=10$$

Proof

Step	Hyp	Ref	Expression
1		df-ple	$$⊢\mathrm{le}=\mathrm{Slot}10$$
2		10nn	$$⊢10\in \mathbb{N}$$
3	1 2	ndxarg	$$⊢{\le }_{\mathrm{ndx}}=10$$