User Selim G

26 votes

6 answers

3k views

How to get convinced that there are a lot of 3-manifolds?

asked Oct 6, 2015 at 13:09

22 votes

2 answers

4k views

Flows of vector fields and diffeomorphisms isotopic to the identity

asked Jan 3, 2014 at 15:11

14 votes

3 answers

683 views

Compact manifolds with big mapping class group

asked Feb 4, 2017 at 12:45

13 votes

2 answers

679 views

Closure of the orbits of the $SL(2,\mathbb{Z})$-action on $\mathbb{R}^2$

asked Nov 17, 2014 at 11:26

12 votes

2 answers

2k views

Negative sectional curvature and constant curvature

asked Jun 7, 2013 at 11:11

11 votes

1 answer

540 views

Topological rigidity for negatively curved manifolds?

asked Jan 24, 2014 at 16:02

11 votes

2 answers

726 views

Minimal, uniquely ergodic but not Lebesgue-ergodic?

asked Oct 12, 2018 at 14:15

10 votes

2 answers

4k views

Examples of non isometric surfaces having the same curvature function

asked Sep 22, 2014 at 8:23

10 votes

4 answers

767 views

When are those subgroups of $\mathrm{SL}(2, \mathbb{C})$ discrete?

asked Jan 16, 2014 at 14:52

9 votes

1 answer

1k views

Fundamental group of an hyperbolic $4$-manifold

asked Jun 4, 2013 at 11:41

9 votes

1 answer

180 views

When do the lengths of simple closed curves determine a hyperbolic surface?

asked Oct 21, 2020 at 12:03

8 votes

3 answers

265 views

Zone of negative curvature on surfaces embedded in $\mathbb{R}^3$

asked Jul 10, 2017 at 14:57

8 votes

4 answers

666 views

Existence of nonergodic polygonal billiard

asked Apr 17, 2014 at 7:44

8 votes

1 answer

708 views

Immersion of $S^1$ in $\mathbb{R}^2$ that can be extended to $\mathbb{D}$

asked Sep 18, 2014 at 14:05

8 votes

2 answers

224 views

Negatively curved metrics minimizing the length of a homotopy class of simple closed curves

asked Apr 20, 2015 at 15:39

8 votes

1 answer

783 views

$\omega$-limits of $1$-dimensional dynamical systems

asked Oct 1, 2016 at 15:02

6 votes

1 answer

621 views

Non uniquely ergodic interval exchange transformations

asked Sep 16, 2016 at 10:16

6 votes

1 answer

214 views

Is the braid group with $n$ strings $\mathcal{B}_n$ a lattice in a connected semi-simple Lie group?

asked May 23, 2015 at 13:49

6 votes

3 answers

608 views

Action of $\pi_1(S)$ on its commutator subgroup

asked Nov 20, 2013 at 17:19

5 votes

2 answers

547 views

Are ramified covering of negatively curved manifolds negatively curved?

asked Nov 18, 2013 at 19:43

5 votes

1 answer

463 views

Structure of the automorphism group of a Riemann surface

asked Feb 23, 2015 at 14:19

5 votes

1 answer

339 views

Irreducible representations containing simple actions of $\mathrm{SL}(2,\mathbb{C})$

asked Jun 11, 2016 at 15:56

4 votes

2 answers

588 views

Homotopy classes of continuous functions $\Sigma_g \longrightarrow \mathbb{R}P^2$

asked Mar 5, 2017 at 15:48

4 votes

2 answers

683 views

Maximal subgroups of $\mathrm{SL}(n,\mathbb{R})$

asked May 17, 2016 at 14:31

4 votes

2 answers

266 views

Metrics with fixed conformal structure and diameter

asked Feb 21, 2018 at 10:33

4 votes

2 answers

196 views

Constructions of complex surfaces covered by the ball of $\mathbb{C}^2$

asked Jun 7, 2022 at 21:28

4 votes

1 answer

279 views

Pseudo-Anosov diffeomorphisms vs reducible diffeomorphisms

asked Dec 7, 2016 at 17:04

4 votes

1 answer

204 views

Stationary phase formula for a complex valued phase

asked Oct 14 at 10:53

3 votes

1 answer

163 views

Non-lattice Veech groups

asked Jul 27, 2016 at 14:44

3 votes

1 answer

1k views

Explicit computation of the action of a Dehn twist on the fundamental group of a surface

asked Dec 29, 2013 at 22:50

Stack Exchange Network

47 Questions

How to get convinced that there are a lot of 3-manifolds?

Flows of vector fields and diffeomorphisms isotopic to the identity

Compact manifolds with big mapping class group

Closure of the orbits of the $SL(2,\mathbb{Z})$-action on $\mathbb{R}^2$

Negative sectional curvature and constant curvature

Topological rigidity for negatively curved manifolds?

Minimal, uniquely ergodic but not Lebesgue-ergodic?

Examples of non isometric surfaces having the same curvature function

When are those subgroups of $\mathrm{SL}(2, \mathbb{C})$ discrete?

Fundamental group of an hyperbolic $4$-manifold

When do the lengths of simple closed curves determine a hyperbolic surface?

Zone of negative curvature on surfaces embedded in $\mathbb{R}^3$

Existence of nonergodic polygonal billiard

Immersion of $S^1$ in $\mathbb{R}^2$ that can be extended to $\mathbb{D}$

Negatively curved metrics minimizing the length of a homotopy class of simple closed curves

$\omega$-limits of $1$-dimensional dynamical systems

Non uniquely ergodic interval exchange transformations

Is the braid group with $n$ strings $\mathcal{B}_n$ a lattice in a connected semi-simple Lie group?

Action of $\pi_1(S)$ on its commutator subgroup

Are ramified covering of negatively curved manifolds negatively curved?

Structure of the automorphism group of a Riemann surface

Irreducible representations containing simple actions of $\mathrm{SL}(2,\mathbb{C})$

Homotopy classes of continuous functions $\Sigma_g \longrightarrow \mathbb{R}P^2$

Maximal subgroups of $\mathrm{SL}(n,\mathbb{R})$

Metrics with fixed conformal structure and diameter

Constructions of complex surfaces covered by the ball of $\mathbb{C}^2$

Pseudo-Anosov diffeomorphisms vs reducible diffeomorphisms

Stationary phase formula for a complex valued phase

Non-lattice Veech groups

Explicit computation of the action of a Dehn twist on the fundamental group of a surface