Metamath Proof Explorer


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 )