Theorem ocndx

Description: Index value of the df-ocomp slot. (Contributed by Mario Carneiro, 25-Oct-2015) (New usage is discouraged.)

	Ref	Expression
Assertion	ocndx	$$⊢\mathrm{oc}\left(\mathrm{ndx}\right)=11$$

Proof

Step	Hyp	Ref	Expression
1		df-ocomp	$$⊢\mathrm{oc}=\mathrm{Slot}11$$
2		1nn0	$$⊢1\in {\mathbb{N}}_0$$
3		1nn	$$⊢1\in \mathbb{N}$$
4	2 3	decnncl	$$⊢11\in \mathbb{N}$$
5	1 4	ndxarg	$$⊢\mathrm{oc}\left(\mathrm{ndx}\right)=11$$