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Ulli
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Top posts
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24
Can a half line separate the plane?
Sep 21, 2024
22
Does there exist a bijective, continuous map from the irrationals onto the reals?
Jul 22, 2022
11
Is there a neat way to prove that $R^2$ is not homeomorphic to $R^2$\{(0,0)}
Nov 22, 2021
9
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
8
Every hereditarily Lindelöf scattered space is countable
Aug 6, 2024
8
Does $\mathcal{P}(\mathbb{N})$ contain an uncountable antichain?
Feb 6, 2024
7
Sizes of compact, separable spaces / compactifications of the integers
Jan 2
7
Is the closure of Noetherian subring in a topological commutative ring also Noetherian?
Oct 15, 2024
Top network posts
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Sizes of compact, separable spaces / compactifications of the integers