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 e. NN
3 1 2 ndxid 
 |-  TopSet = Slot ( TopSet ` ndx )