Theorem edgfndx

Description: Index value of the df-edgf slot. (Contributed by AV, 13-Oct-2024) (New usage is discouraged.)

	Ref	Expression
Assertion	edgfndx	$$⊢\mathrm{ef}\left(\mathrm{ndx}\right)=18$$

Proof

Step	Hyp	Ref	Expression
1		df-edgf	$$⊢\mathrm{ef}=\mathrm{Slot}18$$
2		1nn0	$$⊢1\in {\mathbb{N}}_0$$
3		8nn	$$⊢8\in \mathbb{N}$$
4	2 3	decnncl	$$⊢18\in \mathbb{N}$$
5	1 4	ndxarg	$$⊢\mathrm{ef}\left(\mathrm{ndx}\right)=18$$