Theorem tsetid

Description: Utility theorem: index-independent form of df-tset . (Contributed by NM, 20-Oct-2012)

	Ref	Expression
Assertion	tsetid	⊢ TopSet = Slot ( TopSet ‘ ndx )

Proof

Step	Hyp	Ref	Expression
1		df-tset	⊢ TopSet = Slot 9
2		9nn	⊢ 9 ∈ ℕ
3	1 2	ndxid	⊢ TopSet = Slot ( TopSet ‘ ndx )