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Metamath Proof Explorer

Theorem tsetndx

Description: Index value of the df-tset slot. (Contributed by Mario Carneiro, 14-Aug-2015) (New usage is discouraged.)

		Ref	Expression
	Assertion	tsetndx	$⊢ TopSet (ndx) = 9$

Step	Hyp	Ref	Expression
1		df-tset	$⊢ TopSet = Slot 9$
2		9nn	$⊢ 9 \in ℕ$
3	1 2	ndxarg	$⊢ TopSet (ndx) = 9$