User Ramiro de la Vega

26 votes

Accepted

Does there exist a subset of $\mathbb{R}^2$ which is "very small" and "very big" in the specified way?

answered Dec 7, 2011 at 14:29

26 votes

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Hausdorff spaces with trivial automorphism group

answered Dec 3, 2014 at 10:16

19 votes

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Is there a maximum to the amount of disjoint non-measurable subsets of the unit interval with full outer measure?

answered Jan 23, 2013 at 12:29

17 votes

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Strongly rigid Hausdorff spaces

answered Dec 3, 2014 at 14:14

15 votes

How far is Lindelöf from compactness?

answered Apr 10, 2012 at 20:55

14 votes

Intersection of compact sets in the unit interval

answered Sep 29, 2013 at 2:57

14 votes

If $\mathcal{A} \equiv \mathcal{B}$ and $\mathcal{A} \not \cong \mathcal{B}$, is it possible that $\mathcal{A}$ and $\mathcal{B}$ are bi-embeddable?

answered Aug 25, 2016 at 16:38

14 votes

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What is this equivalence relation on topological spaces: there are bijective continuous maps in both directions

answered Feb 17 at 1:02

13 votes

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Topological spaces determined by generalized metric spaces

answered Aug 14, 2012 at 13:33

12 votes

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Importance of separability vs. second-countability

answered May 21, 2013 at 21:42

12 votes

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Hausdorff space $X$ with $X\cong [X]^2$

answered May 27, 2015 at 15:53

12 votes

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"Productively normal" space

answered Nov 20, 2014 at 15:07

12 votes

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Name for topological spaces where "every point has a local base wellordered by reverse inclusion"?

answered Feb 1, 2019 at 14:21

11 votes

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If G is a sequential topological group, must G x G be sequential?

answered Oct 16, 2013 at 19:39

11 votes

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Hausdorff group topologies on finitely generated groups

answered Nov 28, 2012 at 22:52

11 votes

Unique existence and the axiom of choice

answered Mar 14, 2012 at 21:35

11 votes

Is a inverse limit of compact spaces again compact ?

answered Jan 25, 2012 at 14:04

10 votes

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Substructure Argument for Chain Conditions

answered Oct 19, 2011 at 22:29

10 votes

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Is there a contractible bounded homogeneous space?

answered May 17, 2013 at 21:16

10 votes

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Chromatic number of a connected Hausdorff space

answered Jan 30, 2019 at 22:12

9 votes

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Intuition behind o-minimal structures.

answered Sep 19, 2012 at 17:34

9 votes

Characterization of cocompact group action

answered Oct 25, 2012 at 14:14

8 votes

countable topological spaces of uncountable weight

answered Aug 22, 2012 at 19:12

8 votes

Accepted

The integers as a sequential but non-first countable topological group

answered Dec 14, 2012 at 16:54

8 votes

Two different analytic curves cannot intersect in infinitely many points

answered Feb 12, 2013 at 18:34

8 votes

What is the Stone–Čech compactification of a dense set of $\beta N \setminus N$?

answered Jan 31, 2014 at 14:23

8 votes

Accepted

Is there an uncountable, non-discrete, Hausdorff Toronto space?

answered May 6, 2014 at 16:14

8 votes

When was the "arrow notation" for functions first introduced?

answered Jan 20, 2015 at 17:58

8 votes

Results true in a dimension and false for higher dimensions

answered Sep 15, 2014 at 16:52

8 votes

Between Tietze's and Dugundji's extension theorems

answered Apr 21, 2015 at 18:25

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162 Answers

Does there exist a subset of $\mathbb{R}^2$ which is "very small" and "very big" in the specified way?

Hausdorff spaces with trivial automorphism group

Is there a maximum to the amount of disjoint non-measurable subsets of the unit interval with full outer measure?

Strongly rigid Hausdorff spaces

How far is Lindelöf from compactness?

Intersection of compact sets in the unit interval

If $\mathcal{A} \equiv \mathcal{B}$ and $\mathcal{A} \not \cong \mathcal{B}$, is it possible that $\mathcal{A}$ and $\mathcal{B}$ are bi-embeddable?

What is this equivalence relation on topological spaces: there are bijective continuous maps in both directions

Topological spaces determined by generalized metric spaces

Importance of separability vs. second-countability

Hausdorff space $X$ with $X\cong [X]^2$

"Productively normal" space

Name for topological spaces where "every point has a local base wellordered by reverse inclusion"?

If G is a sequential topological group, must G x G be sequential?

Hausdorff group topologies on finitely generated groups

Unique existence and the axiom of choice

Is a inverse limit of compact spaces again compact ?

Substructure Argument for Chain Conditions

Is there a contractible bounded homogeneous space?

Chromatic number of a connected Hausdorff space

Intuition behind o-minimal structures.

Characterization of cocompact group action

countable topological spaces of uncountable weight

The integers as a sequential but non-first countable topological group

Two different analytic curves cannot intersect in infinitely many points

What is the Stone–Čech compactification of a dense set of $\beta N \setminus N$?

Is there an uncountable, non-discrete, Hausdorff Toronto space?

When was the "arrow notation" for functions first introduced?

Results true in a dimension and false for higher dimensions

Between Tietze's and Dugundji's extension theorems