Question

Does the direct sum of two real line bundles admit a non-vanishing section?

score 52 · Answer 1 · 2026-03-25 19:11:13

52

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Does the direct sum of two real line bundles admit a non-vanishing section?

Published on 25 Mar 2026 - 19:11

score 85 · Answer 2 · 2026-04-12 20:38:42

85

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Derivative between topological vector spaces - equivalence in definition of tangent to $0$

Published on 12 Apr 2026 - 20:38

score 41 · Answer 3 · 2024-03-14 17:57:50

41

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Euclidean lifts of complete vector fields

Published on 14 Mar 2024 - 17:57

score 37 · Answer 4 · 2026-04-03 12:00:56

37

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A non-Hausdorff 1-Manifold

Published on 03 Apr 2026 - 12:00

score 53 · Answer 5 · 2026-03-26 23:09:57

53

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Does collar restrict to a closed neighbourhood?

Published on 26 Mar 2026 - 23:09

score 35 · Answer 6 · 2026-04-11 22:40:28

35

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Can a non-compact contractible bounded submanifold of the Euclidean space be extended to a compact submanifold?

Published on 11 Apr 2026 - 22:40

score 26 · Answer 7 · 2024-03-19 15:55:58

26

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Smooth homology: regularity of the 3-cycle bounded by a pair of homologous surfaces immersed into a three-manifold.

Published on 19 Mar 2024 - 15:55

score 37 · Answer 8 · 2026-04-13 18:30:13

37

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Lee Introduction to Smooth Manifolds Proposition 7.17

Published on 13 Apr 2026 - 18:30

score 60 · Answer 9 · 2026-04-09 18:28:13

60

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Is the zero set of a smooth function disjoint union of smooth manifold in euclidean space?

Published on 09 Apr 2026 - 18:28

score 31 · Answer 10 · 2026-04-13 03:41:08

31

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Why is it only possible to build a homeomorphism rather than a diffeomorphism in Hartman-Grobman Theorem"

Published on 13 Apr 2026 - 3:41

score 62 · Answer 11 · 2026-04-13 12:45:57

62

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A differentiable homeomorphism that isn't a diffeomorphism?

Published on 13 Apr 2026 - 12:45

score 68 · Answer 12 · 2026-04-12 01:43:24

68

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What are the orientable prime compact three-manifolds that can be embedded in $\mathbb{R}^4$?

Published on 12 Apr 2026 - 1:43

score 47 · Answer 13 · 2026-04-13 01:55:33

47

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How to understand the identity atlas, containing a single chart $U \rightarrow U$

Published on 13 Apr 2026 - 1:55

score 51 · Answer 14 · 2026-04-13 04:41:01

51

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Derivative in normed space

Published on 13 Apr 2026 - 4:41

score 29 · Answer 15 · 2024-03-23 18:17:39

29

Views

Give an example of two 3-manifolds with different second de rham groups

Published on 23 Mar 2024 - 18:17

List Question

Does the direct sum of two real line bundles admit a non-vanishing section?

Derivative between topological vector spaces - equivalence in definition of tangent to $0$

Euclidean lifts of complete vector fields

A non-Hausdorff 1-Manifold

Does collar restrict to a closed neighbourhood?

Can a non-compact contractible bounded submanifold of the Euclidean space be extended to a compact submanifold?

Smooth homology: regularity of the 3-cycle bounded by a pair of homologous surfaces immersed into a three-manifold.

Lee Introduction to Smooth Manifolds Proposition 7.17

Is the zero set of a smooth function disjoint union of smooth manifold in euclidean space?

Why is it only possible to build a homeomorphism rather than a diffeomorphism in Hartman-Grobman Theorem"

A differentiable homeomorphism that isn't a diffeomorphism?

What are the orientable prime compact three-manifolds that can be embedded in $\mathbb{R}^4$?

How to understand the identity atlas, containing a single chart $U \rightarrow U$

Derivative in normed space

Give an example of two 3-manifolds with different second de rham groups

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