List questions from obstruction-theory

Published on 23 Mar 2026 - 23:40

295

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Extending a section to a basis of sections in a trivial bundle.

Published on 21 Mar 2026 - 21:53

833

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If $S^1 \hookrightarrow X$ induces an injection of $H_1$, then $X$ retracts onto $S^1$

Published on 11 May 2013 - 12:12

116

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Extending a 2-frame field - manifolds with boundary

Published on 07 Aug 2013 - 13:46

307

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Obstruction to extending $G$-bundle to 4-dimensions in Chern-Simons theory

Published on 09 Oct 2013 - 1:21

359

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Mori's “projective manifolds with ample tangent bundles”, Proposition 3

Published on 22 May 2017 - 13:53

513

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Specific definition of first Stiefel-Whitney class

Published on 05 Jul 2017 - 15:16

606

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Obstruction theory for fibrations.

Published on 08 Jul 2017 - 15:07

83

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Almost complex structures on disk bundles

Published on 04 Aug 2017 - 4:50

250

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Examples for obstructions to a $Spin^c$ structure

Published on 01 Sep 2017 - 7:22

82

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Finding explicit form of the first characteristic class of a fiber bundle over $S^2$

Published on 08 Oct 2017 - 9:11

497

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A counter example in obstruction theory

Published on 02 Apr 2012 - 9:07

72

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Can I lift the maps from $S^2 \times S^3 \rightarrow \frac{U(n)}{O(n)}$ to $S^2 \times S^3 \rightarrow U(n)$

Published on 15 Oct 2020 - 17:16

134

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Why are principal K(A,n) fibrations induced by pullback

Published on 29 Apr 2021 - 0:14

192

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About the obstruction theory and homotopy?

Published on 26 May 2021 - 18:36

List Question

Inversion of Sphere

Extending a section to a basis of sections in a trivial bundle.

If $S^1 \hookrightarrow X$ induces an injection of $H_1$, then $X$ retracts onto $S^1$

Extending a 2-frame field - manifolds with boundary

Obstruction to extending $G$-bundle to 4-dimensions in Chern-Simons theory

Mori's “projective manifolds with ample tangent bundles”, Proposition 3

Specific definition of first Stiefel-Whitney class

Obstruction theory for fibrations.

Almost complex structures on disk bundles

Examples for obstructions to a $Spin^c$ structure

Finding explicit form of the first characteristic class of a fiber bundle over $S^2$

A counter example in obstruction theory

Can I lift the maps from $S^2 \times S^3 \rightarrow \frac{U(n)}{O(n)}$ to $S^2 \times S^3 \rightarrow U(n)$

Why are principal K(A,n) fibrations induced by pullback

About the obstruction theory and homotopy?

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