Set of limit point is a closed set.
33310
Proving that the set of limit points of a set is closed
149820
How do you prove the set $G = \{(x, f(x)) \mid x \in \mathbb R\}$ is closed?
120064
Proving that without the axiom of choice there is a set with an accumulation point that isn'tthe limit of a convergeant sequence
28683
Sum of two closed sets in $\mathbb R$ is closed?
97373
Is whether a set is closed or not a local property?
99064
Uncountable set with exactly one limit point
94485
Limit point compactness implies compactness.
26563
Help completing a proof regarding an infinite family of nested closed subsets in a compact metric space
104016
Limit point of the set $G= \{1/n: n \in \mathbb N\}$?
84512
The preimage of continuous function on a closed set is closed.
102048
Closure of a compact set in Regular space $ X $
13848
Showing that if a subset of a complete metric space is closed, it is also complete
30231
The boundary of union is the union of boundaries when the sets have disjoint closures
32347
Limit of a decreasing sequence of measurable sets.
153495
Continuous function does not map closed set to closed set
78117
Closed property of nonempty finite set
105445
Are the rationals a closed or open set in $\mathbb{R}$?