Closed set on topological space
58101
The set of points where two maps agree is closed?
18828
Base and empty set of a topology
120685
Topology induced from Kuratowski Closure properties
44623
Closed set as a countable intersection of open sets
11114
Is a closed subset of a compact set (which is a subset of a metric space $M$) compact?
47680
Prove that the union of the interior of a set and the boundary of the set is the closure of the set
114608
Proof concerning regular space: there exist a closed set contained in any open set containing $x$
147914
Closed image of locally compact space
50026
Product of compact and closed in topological group is closed
52865
Topological Vector Space: $\dim Z\text{ finite}\implies Z\text{ closed}$
70048
In which topologies do open sets maintain open under countable or arbitrary intersection?
3896
A closed set in $(A, \mathcal T_A)$ that is not closed in $(X, \mathcal T)$
21176
Closure of the set in dictionary order topology.
84104
Definition of neighborhood and open set in topology
125962
The set $A'$ is closed in a $T_1$ space
153495
Continuous function does not map closed set to closed set
61930
Intersection of Closed and Compact Set is Closed