Metamath Proof Explorer


Definition df-tset

Description: Define the topology component of a topological space (structure). (Contributed by NM, 4-Sep-2011) (Revised by Mario Carneiro, 14-Aug-2015) Use its index-independent form tsetid instead. (New usage is discouraged.)

Ref Expression
Assertion df-tset
|- TopSet = Slot 9

Detailed syntax breakdown

Step Hyp Ref Expression
0 cts
 |-  TopSet
1 c9
 |-  9
2 1 cslot
 |-  Slot 9
3 0 2 wceq
 |-  TopSet = Slot 9