List questions from geometric-topology

Published on 25 Mar 2026 - 3:22

207

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Group of orientation preserving homeomorphisms of circle $S^1$ acts transitively on the set of closed intervals of $S^1.$

Published on 28 Nov 2018 - 13:27

261

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Definition of homotopy classes of simple closed curves

Published on 29 Nov 2018 - 16:47

298

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How can you determine if a point is inside a parametric 2D manifold?

Published on 26 Mar 2026 - 14:29

433

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Is there an example of a manifold with fundamental group $\mathbb Z/3 \mathbb Z$?

Published on 30 Nov 2018 - 20:01

360

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The second Betti number of a group

Published on 22 Mar 2026 - 17:15

136

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Which Nonorientable 3 manifolds have torsion in $H_{1}$?

Published on 04 Dec 2018 - 1:17

429

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What exactly this "elliptic" and "hyperbolic" mean on the picture describing Lobachevskian and Riemannian geometry?

Published on 04 Dec 2018 - 19:59

196

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Is a principal $\mathbb{Z}_2\ltimes PSU(4)$-bundle over a 3-manifold $M$ equivalent to an element in $H^1(M,\mathbb{Z}_2)\times H^2(M,\mathbb{Z}_4)$?

Published on 22 Mar 2026 - 8:13

51

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Create a space between clouds

Published on 25 Mar 2026 - 7:38

58

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Notation on fibre bundles

Published on 08 Dec 2018 - 11:37

313

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Which 3-manifolds can be cubulated?

Published on 25 Mar 2026 - 18:53

750

Views

A space obtained by $S^3$ by removing a Hopf link

Published on 13 Dec 2018 - 19:36

274

Views

Request for applications of the Filling Theorem: geometric and algebraic Dehn functions are asymptotically equivalent

Published on 24 Mar 2026 - 23:48

92

Views

Using the Gauss-Bonnet theorem to determine a surface

Published on 21 Dec 2018 - 15:40

List Question

Definition of connected sum and orientation problem

Group of orientation preserving homeomorphisms of circle $S^1$ acts transitively on the set of closed intervals of $S^1.$

Definition of homotopy classes of simple closed curves

How can you determine if a point is inside a parametric 2D manifold?

Is there an example of a manifold with fundamental group $\mathbb Z/3 \mathbb Z$?

The second Betti number of a group

Which Nonorientable 3 manifolds have torsion in $H_{1}$?

What exactly this "elliptic" and "hyperbolic" mean on the picture describing Lobachevskian and Riemannian geometry?

Is a principal $\mathbb{Z}_2\ltimes PSU(4)$-bundle over a 3-manifold $M$ equivalent to an element in $H^1(M,\mathbb{Z}_2)\times H^2(M,\mathbb{Z}_4)$?

Create a space between clouds

Notation on fibre bundles

Which 3-manifolds can be cubulated?

A space obtained by $S^3$ by removing a Hopf link

Request for applications of the Filling Theorem: geometric and algebraic Dehn functions are asymptotically equivalent

Using the Gauss-Bonnet theorem to determine a surface

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