Theorem edgfndx

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

	Ref	Expression
Assertion	edgfndx	⊢ ( .ef ‘ ndx ) = ; 1 8

Proof

Step	Hyp	Ref	Expression
1		df-edgf	⊢ .ef = Slot ; 1 8
2		1nn0	⊢ 1 ∈ ℕ0
3		8nn	⊢ 8 ∈ ℕ
4	2 3	decnncl	⊢ ; 1 8 ∈ ℕ
5	1 4	ndxarg	⊢ ( .ef ‘ ndx ) = ; 1 8