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Metamath Proof Explorer

Theorem unifndx

Description: Index value of the df-unif slot. (Contributed by Thierry Arnoux, 17-Dec-2017) (New usage is discouraged.)

		Ref	Expression
	Assertion	unifndx	$⊢ UnifSet (ndx) = 13$

Step	Hyp	Ref	Expression
1		df-unif	$⊢ UnifSet = Slot 13$
2		1nn0	$⊢ 1 \in ℕ_{0}$
3		3nn	$⊢ 3 \in ℕ$
4	2 3	decnncl	$⊢ 13 \in ℕ$
5	1 4	ndxarg	$⊢ UnifSet (ndx) = 13$