List questions from differential-topology

Published on 25 Mar 2026 - 2:24

221

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Question about the homology groups of the complex projective space $\mathbb{C}P_n$

Published on 25 Mar 2026 - 6:11

444

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Why are $C^\infty_p\neq C^\infty_q$ when $p\neq q$?

Published on 03 Nov 2018 - 13:06

360

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About a proof using complex numbers that the antipodal map on $S^n$, $n$ odd, is homotopic to the identity map

Published on 26 Mar 2026 - 8:23

62

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Coherence of Foliated Atlases is an Equivalence Relation

Published on 25 Mar 2026 - 14:16

73

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Is this set dense in $\mathcal{C}^{\infty} (\mathbb{S}^3 , \mathbb{R}^3 ) $?

Published on 04 Nov 2018 - 17:27

422

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How can we formalize Jorge Luis Borges' Aleph?

Published on 27 Mar 2026 - 14:29

921

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Proof that the boundary of the square is not an embedded submanifold

Published on 05 Nov 2018 - 8:57

55

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A difficulty in understanding a paragraph in p.41 in Guillemin & Pollack.

Published on 26 Mar 2026 - 12:58

1.5k

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The relationship between the differential and the directional derivative of a function

Published on 05 Nov 2018 - 18:03

99

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Existence of a diffemorphism that maps one curve to another

Published on 05 Nov 2018 - 18:51

328

Views

How to show the local section of a vector bundle $E\to M$ is continuous?

Published on 26 Mar 2026 - 6:27

1.6k

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Homotopy class of map from torus to sphere?

Published on 05 Nov 2018 - 22:26

57

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Existence of certain surfaces in flat riemannian 3-manifold

Published on 27 Mar 2026 - 16:26

106

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Stiefel-Whitney class of $O(2)$ and $SO(2)$

Published on 06 Nov 2018 - 20:41

List Question

The tangent bundle of a foliation is in fact a vector bundle

Question about the homology groups of the complex projective space $\mathbb{C}P_n$

Why are $C^\infty_p\neq C^\infty_q$ when $p\neq q$?

About a proof using complex numbers that the antipodal map on $S^n$, $n$ odd, is homotopic to the identity map

Coherence of Foliated Atlases is an Equivalence Relation

Is this set dense in $\mathcal{C}^{\infty} (\mathbb{S}^3 , \mathbb{R}^3 ) $?

How can we formalize Jorge Luis Borges' Aleph?

Proof that the boundary of the square is not an embedded submanifold

A difficulty in understanding a paragraph in p.41 in Guillemin & Pollack.

The relationship between the differential and the directional derivative of a function

Existence of a diffemorphism that maps one curve to another

How to show the local section of a vector bundle $E\to M$ is continuous?

Homotopy class of map from torus to sphere?

Existence of certain surfaces in flat riemannian 3-manifold

Stiefel-Whitney class of $O(2)$ and $SO(2)$

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