List questions from differential-topology

Published on 16 Apr 2026 - 21:51

110

Views

Can any smooth function be written in this form?

Published on 10 Apr 2026 - 6:22

95

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Three complex and Euler characteristic zero

Published on 15 Apr 2026 - 7:58

349

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Parameterization and geodesics of a 3-torus

Published on 11 Apr 2026 - 12:23

205

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Brouwer degree extension Lemma

Published on 11 Apr 2026 - 22:37

1.4k

Views

Self-indexing Morse function on a torus which is a height function

Published on 25 Apr 2026 - 10:28

523

Views

Complement of a knot that isn't rationally null-homologous

Published on 28 Mar 2026 - 6:40

1.2k

Views

Can a Compact Lie Group have a Non-Compact Lie Subgroup?

Published on 11 Apr 2026 - 13:02

221

Views

Can we get a torus by identifying surface with removed disc and mobius strip?

Published on 15 Apr 2026 - 2:26

35

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Does a map with fibers $S^2\vee S^2$ have to be a locally trivial $S^2\vee S^2$ bundle?

Published on 15 Apr 2026 - 4:58

168

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Is the associated bundle construction a bifunctor?

Published on 11 Apr 2026 - 10:51

71

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Let $M$ be a manifold noncompact. Then there is a closed embebdding of the half line $[0, \infty)$ into $M$.

Published on 14 Apr 2026 - 20:32

769

Views

What is an integral differential form and how do we recognize it as such?

Published on 13 Apr 2026 - 4:21

5k

Views

Examples of a categories without products

Published on 15 Apr 2026 - 23:12

117

Views

Why is even codimension necessary to apply excision for the Euler characteristic?

Published on 13 Apr 2026 - 7:33

List Question

Brouwer Degree is locally constant

Can any smooth function be written in this form?

Three complex and Euler characteristic zero

Parameterization and geodesics of a 3-torus

Brouwer degree extension Lemma

Self-indexing Morse function on a torus which is a height function

Complement of a knot that isn't rationally null-homologous

Can a Compact Lie Group have a Non-Compact Lie Subgroup?

Can we get a torus by identifying surface with removed disc and mobius strip?

Does a map with fibers $S^2\vee S^2$ have to be a locally trivial $S^2\vee S^2$ bundle?

Is the associated bundle construction a bifunctor?

Let $M$ be a manifold noncompact. Then there is a closed embebdding of the half line $[0, \infty)$ into $M$.

What is an integral differential form and how do we recognize it as such?

Examples of a categories without products

Why is even codimension necessary to apply excision for the Euler characteristic?

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