Image of a Hausdorff Space with certain conditions is closed
118851
$X$ be a Hausdorff topological space , let $f:X \to X$ be a continuous map such that $f\circ f=f$ , then is $f(X)$ is closed in $X$ ?
65180
A compact Hausdorff space that is not metrizable
130975
Given a pair of continuous functions from a topological space to an ordered set, how to prove that this set is closed?
13848
Showing that if a subset of a complete metric space is closed, it is also complete
113534
Show that any metrizable space $X$ is Hausdorff
66293
$der(\{x\})$ is closed and $x\in der(der(A))$
157603
Continuity $\iff$ Preimage is closed whenever set is closed
61930
Intersection of Closed and Compact Set is Closed
14516
The space of continuous functions $C([0,1])$ is not complete in the $L^2$ norm
120135
Show every nonempty compact Hausdorff space is not the countable union of nowhere dense sets
148112
Prove that a topological space equipped with a delta-complex structure is Hausdorff
82355
When is the image of a linear operator (between Banach spaces) closed?
88185
Proof that a subspace $A$ of a complete metric space $X$ is complete iff $A$ is closed
10180
How to prove that this set is closed?
52629
Example 1, Sec. 22 in Munkres' TOPOLOGY, 2nd edition: How to verify that this map is closed?
147914
Closed image of locally compact space
115272
Showing that projections $\mathbb{R}^2 \to \mathbb{R}$ are not closed