What is an example of a nonmetrizable topological space?
34298
sequentially continuous on a non first-countable
15128
Example of non-decomposable ideal
47937
Example of a Borel set that is neither $F_\sigma$ nor $G_\delta$
128481
Can two different topological spaces cover each other?
152679
Homogeneous topological spaces
100476
Why does a Hausdorff but not countably compact space have an infinite closed discrete subset?
74330
$\mathbb{R}^n$ not homeomorphic to open subset of $\mathbb{R}^m$
89749
Example of a not recursively enumerable set $A \subseteq \mathbb{N}$
151950
Why is indiscrete topology unmetrizable?
147961
Characterizing simply connected spaces
87580
Canonical examples of inner product spaces that are not Hilbert spaces?
51871
Characterization of Topology
32819
Looking for examples of first countable, compact spaces which is not separable
150961
An example for a homomorphism that is not an automorphism
39842
Limit point Compactness does not imply compactness counter-example
14496
Is there any example of a non-measurable set whose proof of existence doesn't appeal to the Axiom of choice?
65180
A compact Hausdorff space that is not metrizable