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Ulli
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21
Does there exist a bijective, continuous map from the irrationals onto the reals?
Jul 22, 2022
9
Is there a neat way to prove that $R^2$ is not homeomorphic to $R^2$\{(0,0)}
Nov 22, 2021
8
uncountable principal ideal domain with few units
Sep 2, 2020
8
Separation of finite sets in homogeneous spaces by homeomorphisms
Feb 26, 2022
8
Spaces in which every sequence of distinct points converges
Mar 3, 2023
6
Investigating a property related to the biconnected property
Mar 8, 2023
6
Are Hausdorff countably compact topological groups always normal?
May 31
6
Are all compact subsets of $\mathbb R^{\mathbb R}$ separable?
Apr 8, 2022
6
Do locally compact Hausdorff spaces admit local bases consisting of normal open neighbourhoods?
Jul 24, 2022
5
If a space is covered by two totally disconnected closed subsets, is the space totally disconnected?
Apr 11