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