What is this space called in general topology?
70048
In which topologies do open sets maintain open under countable or arbitrary intersection?
60236
What is the difference between topological and metric spaces?
133808
A doubt from Milnor's "Topology from a Differentiable Viewpoint".
128481
Can two different topological spaces cover each other?
85870
Show this set is a base for some topology on $\mathbb{Z}$
127691
Confusion Regarding Munkres's Definition of Basis for a Topology
88028
Topology - closures of intervals with the order topology
14713
$X=(-\infty,0]\cup\left\{{1\over n}:n\in\mathbb N\right\}$ with subspace topology Then
51710
Is there an infinite connected topological space such that every space obtained by removing one point from it is totally disconnected?
114856
Universal property of initial topology
108864
Showing that two topologies give rise to the same topology
24699
A regular, Lindelöf space is normal
88714
Are there more general spaces than Euclidean spaces to have the Heine–Borel property?
147961
Characterizing simply connected spaces
70198
Why this two spaces do not homeomorphic?
118323
What is the topological dual of a dual space with the weak* topology?
111360
Topological spaces in which every proper closed subset is compact