Theorem eufndx

Description: Index value of the Euclidean function slot. Use ndxarg . (Contributed by Thierry Arnoux, 22-Mar-2025) (New usage is discouraged.)

	Ref	Expression
Assertion	eufndx	⊢ ( EuclF ‘ ndx ) = ; 2 1

Proof

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