Question

Showing that $\mathbb S^1$ is a deformation retract of the Mobius strip, rigorously.

score 2.1k · Answer 1 · 2026-03-25 14:26:07

2.1k

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Showing that $\mathbb S^1$ is a deformation retract of the Mobius strip, rigorously.

Published on 25 Mar 2026 - 14:26

score 3.1k · Answer 2 · 2015-08-05 17:51:53

3.1k

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Examples of manifolds that are not boundaries

Published on 05 Aug 2015 - 17:51

score 348 · Answer 3 · 2026-03-25 09:29:14

348

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Fundamental group of result of 0-Dehn surgery and meridian

Published on 25 Mar 2026 - 9:29

score 33 · Answer 4 · 2026-03-25 11:23:10

33

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How to qualify a N dimensional manifold as Compact under following condions?

Published on 25 Mar 2026 - 11:23

score 523 · Answer 5 · 2026-03-10 23:41:25

523

Views

Einstein manifolds and topology

Published on 10 Mar 2026 - 23:41

score 266 · Answer 6 · 2026-03-20 07:10:17

266

Views

Finitely Many genus-g Quotients of Compact Riemann Surface

Published on 20 Mar 2026 - 7:10

score 40 · Answer 7 · 2026-03-20 14:50:54

40

Views

About the number of minimum parametrizations of a $1$-smooth manifold compact w/ boundary in $\mathbb{R}^{3}$

Published on 20 Mar 2026 - 14:50

score 202 · Answer 8 · 2026-03-25 16:50:44

202

Views

A very general question about blow-up for experienced symplectic topologists and algebraic geometers

Published on 25 Mar 2026 - 16:50

score 123 · Answer 9 · 2015-11-21 12:54:51

123

Views

The nature of components in a certain manifold

Published on 21 Nov 2015 - 12:54

score 813 · Answer 10 · 2015-11-27 05:13:49

813

Views

Volumes of hyperbolic manifolds

Published on 27 Nov 2015 - 5:13

score 243 · Answer 11 · 2026-03-06 19:30:58

243

Views

Why is it impossible for a compact connected non-orientable $n$-manifold to be the suspension of some connected based space?

Published on 06 Mar 2026 - 19:30

score 140 · Answer 12 · 2026-03-23 23:31:29

140

Views

How can uncountably many closed smooth 4-manifolds be presented by an essentially countable alphabet (Kirby diagrams)?

Published on 23 Mar 2026 - 23:31

score 49 · Answer 13 · 2026-03-23 23:32:16

49

Views

Why is the sectional shape of a simply connected, oriented 4-manifold an isomorphism?

Published on 23 Mar 2026 - 23:32

score 3.3k · Answer 14 · 2016-01-20 22:47:02

3.3k

Views

Every open set in $\mathbb{R}^n$ is the increasing union of compact sets.

Published on 20 Jan 2016 - 22:47

score 330 · Answer 15 · 2026-03-21 13:00:53

330

Views

Momentum is quantised in compact spaces?

Published on 21 Mar 2026 - 13:00

List Question

Showing that $\mathbb S^1$ is a deformation retract of the Mobius strip, rigorously.

Examples of manifolds that are not boundaries

Fundamental group of result of 0-Dehn surgery and meridian

How to qualify a N dimensional manifold as Compact under following condions?

Einstein manifolds and topology

Finitely Many genus-g Quotients of Compact Riemann Surface

About the number of minimum parametrizations of a $1$-smooth manifold compact w/ boundary in $\mathbb{R}^{3}$

A very general question about blow-up for experienced symplectic topologists and algebraic geometers

The nature of components in a certain manifold

Volumes of hyperbolic manifolds

Why is it impossible for a compact connected non-orientable $n$-manifold to be the suspension of some connected based space?

How can uncountably many closed smooth 4-manifolds be presented by an essentially countable alphabet (Kirby diagrams)?

Why is the sectional shape of a simply connected, oriented 4-manifold an isomorphism?

Every open set in $\mathbb{R}^n$ is the increasing union of compact sets.

Momentum is quantised in compact spaces?

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