User Alessandro Codenotti

7 votes

Accepted

Embeds in a topological W-group, or a W-space that embeds in a topological group?

answered Apr 7 at 16:39

2 votes

Extending $\mathbb{R}$ to a higher dimensional manifold

answered Apr 5 at 11:18

4 votes

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Does every topological group embed as a closed subgroup in an amenable group?

answered Jun 3, 2021 at 16:33

3 votes

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Erdős–Sierpiński duality in locally compact Polish groups (e.g. $\mathbb{R}^n$)

answered Jan 4 at 15:41

2 votes

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Shrinkable homogeneous compact and connected $T_2$-space

answered Nov 29, 2023 at 16:47

24 votes

What is the most "concrete-feeling" equivalent formulation of the Continuum Hypothesis that you can think of?

answered Nov 25, 2023 at 21:08

4 votes

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Does $(\omega, E)$ with the cycle condition have an $\omega$-path?

answered Jul 31, 2023 at 19:00

1 vote

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Competing definitions of smooth orbit equivalence relation

answered Jun 4, 2023 at 9:27

7 votes

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Extreme amenability of topological groups and invariant means

answered Jun 3, 2023 at 14:42

9 votes

Connected space being not locally connected at each point

answered May 2, 2023 at 10:07

4 votes

Existence of a homogeneous cyclic order for arbitrary infinite cardinals

answered Jul 4, 2022 at 5:23

6 votes

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Conflict-free coloring of $\mathbb{R}$ with the Euclidean topology

answered Feb 22, 2022 at 21:56

7 votes

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In a Polish space, is every analytic set the continuous image of a Borel set from the same Polish space?

answered Oct 20, 2021 at 15:42

2 votes

Accepted

When does $C(X)$, $X$ a continuum, admit a continuous choice function?

answered Oct 19, 2021 at 9:46

0 votes

Intersection of all open subgroups vs. the intersection of all open normal subgroups

answered Aug 6, 2021 at 7:11

9 votes

Uncountable counterexamples in algebra

answered May 10, 2021 at 4:08

11 votes

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Coloring almost-disjointness

answered May 7, 2021 at 17:55

3 votes

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A continuous map with zero-dimensional fibres

answered May 6, 2021 at 8:32

12 votes

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Closed manifolds are not absolute retracts?

answered Mar 15, 2021 at 11:19

18 votes

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Is every element of $\omega_1$ the rank of some Borel set?

answered Nov 12, 2020 at 14:35

4 votes

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Topological properties inherited by the Hausdorff metric space

answered Jun 23, 2020 at 10:08

7 votes

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Different locally compact metrizable second countable topologies on the same group

answered Feb 8, 2020 at 9:05

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22 Answers

Embeds in a topological W-group, or a W-space that embeds in a topological group?

Extending $\mathbb{R}$ to a higher dimensional manifold

Does every topological group embed as a closed subgroup in an amenable group?

Erdős–Sierpiński duality in locally compact Polish groups (e.g. $\mathbb{R}^n$)

Shrinkable homogeneous compact and connected $T_2$-space

What is the most "concrete-feeling" equivalent formulation of the Continuum Hypothesis that you can think of?

Does $(\omega, E)$ with the cycle condition have an $\omega$-path?

Competing definitions of smooth orbit equivalence relation

Extreme amenability of topological groups and invariant means

Connected space being not locally connected at each point

Existence of a homogeneous cyclic order for arbitrary infinite cardinals

Conflict-free coloring of $\mathbb{R}$ with the Euclidean topology

In a Polish space, is every analytic set the continuous image of a Borel set from the same Polish space?

When does $C(X)$, $X$ a continuum, admit a continuous choice function?

Intersection of all open subgroups vs. the intersection of all open normal subgroups

Uncountable counterexamples in algebra

Coloring almost-disjointness

A continuous map with zero-dimensional fibres

Closed manifolds are not absolute retracts?

Is every element of $\omega_1$ the rank of some Borel set?

Topological properties inherited by the Hausdorff metric space

Different locally compact metrizable second countable topologies on the same group