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15
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Inversion of Sphere

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#differential-topology #homotopy-theory #obstruction-theory
303
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Extending a section to a basis of sections in a trivial bundle.

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#differential-geometry #differential-topology #vector-bundles #obstruction-theory
835
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If $S^1 \hookrightarrow X$ induces an injection of $H_1$, then $X$ retracts onto $S^1$

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#algebraic-topology #obstruction-theory
118
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Extending a 2-frame field - manifolds with boundary

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#algebraic-topology #differential-topology #obstruction-theory
309
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Obstruction to extending $G$-bundle to 4-dimensions in Chern-Simons theory

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#mathematical-physics #gauge-theory #obstruction-theory
361
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Mori's “projective manifolds with ample tangent bundles”, Proposition 3

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#abstract-algebra #algebraic-geometry #commutative-algebra #birational-geometry #obstruction-theory
515
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Specific definition of first Stiefel-Whitney class

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#algebraic-topology #homology-cohomology #characteristic-classes #obstruction-theory
609
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Obstruction theory for fibrations.

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#algebraic-topology #fibration #obstruction-theory
85
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Almost complex structures on disk bundles

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#algebraic-topology #manifolds #differential-topology #almost-complex #obstruction-theory
252
Views

Examples for obstructions to a $Spin^c$ structure

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#algebraic-topology #characteristic-classes #obstruction-theory
84
Views

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

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#algebraic-topology #fiber-bundles #characteristic-classes #obstruction-theory
501
Views

A counter example in obstruction theory

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#algebraic-topology #examples-counterexamples #obstruction-theory
74
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Can I lift the maps from $S^2 \times S^3 \rightarrow \frac{U(n)}{O(n)}$ to $S^2 \times S^3 \rightarrow U(n)$

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#algebraic-topology #homotopy-theory #obstruction-theory
136
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Why are principal K(A,n) fibrations induced by pullback

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#algebraic-topology #homotopy-theory #obstruction-theory
194
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About the obstruction theory and homotopy?

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#algebraic-topology #homotopy-theory #vector-bundles #characteristic-classes #obstruction-theory

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