Question

Given a $n-2$ dimensional closed submanifold of $\mathbb{R}^n$, is it the boundary of some $n-1$ dimensional submanifold?

score 37 · Answer 1 · 2026-04-13 20:23:45

37

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Given a $n-2$ dimensional closed submanifold of $\mathbb{R}^n$, is it the boundary of some $n-1$ dimensional submanifold?

Published on 13 Apr 2026 - 20:23

score 466 · Answer 2 · 2026-05-10 13:49:26

466

Views

Irreducible Hausdorff Topological Spaces

Published on 10 May 2026 - 13:49

score 336 · Answer 3 · 2026-05-10 21:41:50

336

Views

Homology/Cohomology Theories for Non-Locally Connected Spaces

Published on 10 May 2026 - 21:41

score 61 · Answer 4 · 2026-05-10 18:29:04

61

Views

Homotoping curves in 3/4-manifolds to lie on embedded tori?

Published on 10 May 2026 - 18:29

score 135 · Answer 5 · 2026-04-15 03:28:12

135

Views

Killing 2nd homology by including 3-manifold as the boundary of a 4-manifold

Published on 15 Apr 2026 - 3:28

score 1.8k · Answer 6 · 2026-04-14 14:48:46

1.8k

Views

Isotopy classes of embedded closed curves in a torus

Published on 14 Apr 2026 - 14:48

score 217 · Answer 7 · 2026-05-10 19:37:15

217

Views

Factorization of Products of Manifolds

Published on 10 May 2026 - 19:37

score 422 · Answer 8 · 2026-04-12 16:56:44

422

Views

Is every diffeomorphism of the n-torus isotopic to a linear one?

Published on 12 Apr 2026 - 16:56

score 114 · Answer 9 · 2026-04-17 03:40:54

114

Views

Decomposition of Matrix Representation of a Parallelizable Riemannian Metric

Published on 17 Apr 2026 - 3:40

score 199 · Answer 10 · 2026-04-29 12:22:09

199

Views

Understanding Corollaries of the h-cobordism theorem

Published on 29 Apr 2026 - 12:22

score 107 · Answer 11 · 2026-05-05 04:02:02

107

Views

On Bruhat - Tits building of $PGL_4(K)$

Published on 05 May 2026 - 4:02

score 89 · Answer 12 · 2026-05-10 13:26:21

89

Views

identifying a specific 3d manifold: A torus fibered over a circle with a $Z_2$ twist.

Published on 10 May 2026 - 13:26

score 174 · Answer 13 · 2026-04-13 22:05:36

174

Views

A naïve attempt at an elementary proof of Jordan-Brouwer separation theorem

Published on 13 Apr 2026 - 22:05

score 136 · Answer 14 · 2026-05-10 14:05:51

136

Views

$\mathbb{R}$ with co-countable topology is not a topological group

Published on 10 May 2026 - 14:05

score 33 · Answer 15 · 2026-04-15 01:56:11

33

Views

How do I detect the aberrations that prevent a smooth curve in the following image?

Published on 15 Apr 2026 - 1:56

List Question

Given a $n-2$ dimensional closed submanifold of $\mathbb{R}^n$, is it the boundary of some $n-1$ dimensional submanifold?

Irreducible Hausdorff Topological Spaces

Homology/Cohomology Theories for Non-Locally Connected Spaces

Homotoping curves in 3/4-manifolds to lie on embedded tori?

Killing 2nd homology by including 3-manifold as the boundary of a 4-manifold

Isotopy classes of embedded closed curves in a torus

Factorization of Products of Manifolds

Is every diffeomorphism of the n-torus isotopic to a linear one?

Decomposition of Matrix Representation of a Parallelizable Riemannian Metric

Understanding Corollaries of the h-cobordism theorem

On Bruhat - Tits building of $PGL_4(K)$

identifying a specific 3d manifold: A torus fibered over a circle with a $Z_2$ twist.

A naïve attempt at an elementary proof of Jordan-Brouwer separation theorem

$\mathbb{R}$ with co-countable topology is not a topological group

How do I detect the aberrations that prevent a smooth curve in the following image?

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