List questions from differential-topology

Published on 14 Apr 2026 - 0:57

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Properties preserved by diffeomorphisms but not by homeomorphisms

Published on 10 Apr 2026 - 16:05

256

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extension to the ball of sphere immersion

Published on 10 Apr 2026 - 7:10

359

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Real analytic diffeomorphisms of the disk

Published on 16 Apr 2026 - 4:59

4.7k

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Diffeomorphism group of the unit circle

Published on 17 Apr 2026 - 13:42

15.9k

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"Immediate" Applications of Differential Geometry

Published on 13 Apr 2026 - 18:07

1.7k

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What can Lefschetz fixed point theorem tell us about the group of automorphisms of a compact Riemann surface?

Published on 13 Apr 2026 - 12:15

143

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Non-intersecting smooth paths in the plane and the relation to curvature

Published on 11 Apr 2026 - 11:27

306

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Action of U(1) on a sphere bundle

Published on 13 Apr 2026 - 23:05

283

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$\{\gamma \in C^0([0,1],M): \gamma (0)=p, \gamma (1)=q\}$ with the compact-open top has the homotopy type of a CW complex

Published on 17 Apr 2026 - 5:42

405

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A theorem in Morse theory

Published on 11 Apr 2026 - 22:21

292

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How does a geodesic equation on an n-manifold deal with singularities?

Published on 10 Apr 2026 - 2:56

1.1k

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Image of smooth vector bundle morphism

Published on 15 Apr 2026 - 18:57

529

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Preimage of submanifold under an embedding

Published on 13 Apr 2026 - 22:09

338

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What's so special about a homotopy $15$-sphere?

Published on 17 Apr 2026 - 4:57

List Question

metric on the Euclidean Group

Properties preserved by diffeomorphisms but not by homeomorphisms

extension to the ball of sphere immersion

Real analytic diffeomorphisms of the disk

Diffeomorphism group of the unit circle

"Immediate" Applications of Differential Geometry

What can Lefschetz fixed point theorem tell us about the group of automorphisms of a compact Riemann surface?

Non-intersecting smooth paths in the plane and the relation to curvature

Action of U(1) on a sphere bundle

$\{\gamma \in C^0([0,1],M): \gamma (0)=p, \gamma (1)=q\}$ with the compact-open top has the homotopy type of a CW complex

A theorem in Morse theory

How does a geodesic equation on an n-manifold deal with singularities?

Image of smooth vector bundle morphism

Preimage of submanifold under an embedding

What's so special about a homotopy $15$-sphere?

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