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15
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The boundaries of a chain of a compact set is in the compliment of that set?

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#algebraic-topology #homology-cohomology
121
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Two different maps of a cylinder into $\Bbb R^3$

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#algebraic-topology #homotopy-theory #covering-spaces
232
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CW complex structure of $\mathbb{CP}^1$

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#algebraic-topology #cw-complexes
88
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If the fiber and the base are parallelizable then so is the total space?

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#differential-geometry #algebraic-topology #manifolds #vector-bundles
78
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Uniqueness of a homotopy category.

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#algebraic-topology #category-theory #homotopy-theory #stable-homotopy-theory
66
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Sufficient condition for weak homotopy equivalence

Published on
#reference-request #algebraic-topology #homotopy-theory
309
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Mayer-Vietoris sequence in topological K-theory

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#algebraic-topology #topological-k-theory
561
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Homeomorphism lifting a covering map

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#general-topology #algebraic-topology #covering-spaces
637
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The real projective plane minus one point is diffeomorphic ...

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#algebraic-topology #smooth-manifolds
767
Views

Direct sum of vector bundles is a trivial bundle

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#algebraic-topology #vector-bundles
61
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Name of this topological property of manifolds (and intrinsic geometry of curves)

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#general-topology #differential-geometry #algebraic-topology #riemannian-geometry #curves
239
Views

Are these strengthenings of Serre-Swan and Gelfand-Naimark true?

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#general-topology #algebraic-topology #commutative-algebra #vector-bundles #topological-k-theory
45
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"Canonical unit element" of a ring spectrum

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#algebraic-topology
88
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Real faithful representations of $\mathrm{SL}(2,5)$

Published on
#group-theory #reference-request #algebraic-topology #representation-theory
483
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Geometric interpretation of the cohomology with coefficients in a local system

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#differential-geometry #algebraic-topology #homological-algebra #homotopy-theory

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