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15
108
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Half rotation about $S^1$

Published on
#general-topology #algebraic-topology #rotations
158
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Definition of the operation in the nth singular chain group?

Published on
#group-theory #algebraic-topology #homology-cohomology
350
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Continuous on paths implies continuous if space is locally path-connected?

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#general-topology #algebraic-topology
136
Views

"Inverse" Riemann-Hurwitz

Published on
#algebraic-topology #surfaces #covering-spaces
267
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Necessary conditions for a Reedy fibrant diagram

Published on
#algebraic-topology #homotopy-theory #simplicial-stuff #model-categories
163
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Same homology and distinct homotopy on torus

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#algebraic-topology #homology-cohomology #homotopy-theory
740
Views

Proof of Hopf's theorem (the one about cohomology of Lie groups being equal to the cohomology of a product of spheres)

Published on
#differential-geometry #reference-request #algebraic-topology #lie-groups #homology-cohomology
183
Views

$\infty$-categories definition disambiguation

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#algebraic-topology #simplicial-stuff #topos-theory #higher-category-theory
217
Views

Cell structure of join spheres

Published on
#general-topology #algebraic-topology
286
Views

Induced homomorphism on $S^1$ non-trivial

Published on
#algebraic-topology #fundamental-groups
361
Views

Intersection of paths on unit square using Brouwer fixed point theorem

Published on
#algebraic-topology #fixed-point-theorems
278
Views

What is "homologous map"?

Published on
#general-topology #algebraic-topology #game-theory
621
Views

A pushout of an acyclic cofibration is an acyclic cofibration

Published on
#algebraic-topology #homotopy-theory
133
Views

Fake proof of $2p_1=0$

Published on
#algebraic-topology #fake-proofs #characteristic-classes
207
Views

Using Mayer-Vietoris to find map whose degree is arbitrary natural number from $S^n \rightarrow S^n$

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#algebraic-topology #homology-cohomology

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