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Mathieu Baillif's user avatar
Mathieu Baillif's user avatar
Mathieu Baillif's user avatar
Mathieu Baillif
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18 Answers

Score Activity Newest
10 votes
Accepted

When the boundary of any subset is compact?

8 votes
Accepted

Collared boundary of a non-metrizable manifold

7 votes
Accepted

Is there a non-metrizable topological space for which any countably compact subset is compact?

7 votes
Accepted

Closed totally disconnected subspaces

7 votes

"Abnormal" manifold

6 votes
Accepted

Is there a first-countable space containing a closed discrete subset which is not $G_\delta$?

5 votes

Minimal refinements of open covers of $T_2$-spaces

5 votes
Accepted

Is there a maximal connected Hausdorff space?

5 votes

Axiom of choice for sets of finite sets

5 votes
Accepted

Contractible and Delta-generated implies strong deformation retract to a point?

4 votes
Accepted

$n$-star-compactness

4 votes
Accepted

A countable tight topological group where every countable subset is metrizable

3 votes

Maximal contractible-ish Hausdorff surfaces

2 votes

Totally disconnected subspaces

2 votes

A completely regular space that is very non-normal

1 vote
Accepted

A question on linearly lindelof space

0 votes

Given $f$ from the cylinder $C$ to the interval constant on one boundary, is there a $r:C\to C$ constant on a boundary with $f\circ r = f$?

0 votes

How bad can a circle domain get?

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