Definition df-tset 17316

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 17397 instead. (New usage is discouraged.)

Assertion

Ref	Expression
df-tset	⊢ TopSet = Slot 9

Detailed syntax breakdown of Definition df-tset

Step	Hyp	Ref	Expression
1		cts 17303	. 2 class TopSet
2		c9 12328	. . 3 class 9
3	2	cslot 17218	. 2 class Slot 9
4	1, 3	wceq 1540	1 wff TopSet = Slot 9

This definition is referenced by:  tsetndx  17396  tsetid  17397  sratsetOLD  21189  eltpsgOLD  22950  indistpsALTOLD  23021