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15
420
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Stiefel–Whitney class, obstructions and exact sequences

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#algebraic-topology #differential-topology #geometric-topology #fiber-bundles #characteristic-classes
101
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General Stiefel-Whitney classes and Stiefel manifolds

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#general-topology #algebraic-topology #differential-topology #geometric-topology #stiefel-manifolds
59
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From $\mathbb{R}^4$ to a topological sphere $S^2$

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#general-topology #geometric-topology #fiber-bundles
35
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Valuation Property for mean width

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#geometric-topology #convex-geometry #geometric-probability
64
Views

How to pair the Arf with Stiefel-Whitney class?

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#algebraic-topology #differential-topology #geometric-topology #characteristic-classes #cobordism
45
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Terminology for topologies that can't be embedded in a plane (without severing the topology)?

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#terminology #geometric-topology
79
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$\pi_3(Sp(N))=\mathbb{Z}$, $\pi_4(Sp(N))=\mathbb{Z}_2$, $\pi_5(Sp(N))=\mathbb{Z}_2$?

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#general-topology #algebraic-topology #homotopy-theory #geometric-topology #spectral-sequences
83
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Atiyah-(Patodi)-Singer index theorem and an instanton on $S^5$

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#differential-geometry #differential-topology #mathematical-physics #geometric-topology #fermi-dirac-integral
142
Views

Understand the suspension (topology) and some Lie group examples

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#general-topology #lie-groups #geometric-topology #morphism
100
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The pattern of Mills Mess juggling and a link invariant in 3D?

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#general-topology #curves #geometric-topology #knot-theory #pattern-recognition
891
Views

The suspension (topology) and elementary examples

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#general-topology #manifolds #geometric-topology
64
Views

Can two ellipsoids meet in a pair of ellipses intersecting in four points?

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#linear-algebra #geometry #geometric-topology #topological-vector-spaces
528
Views

Understanding De/Suspension $\Sigma^{-1}(\Sigma{X})\neq X$

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#general-topology #manifolds #geometric-topology #morphism
329
Views

Understanding Adams spectral sequence and Pontryagin-Thom isomorphism intuitively

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#algebraic-topology #geometric-topology #spectral-sequences #k-theory #stable-homotopy-theory
115
Views

Induced stable framing on circles

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#algebraic-topology #differential-topology #homotopy-theory #geometric-topology

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