List questions from homotopy-theory

Published on 31 Mar 2016 - 3:07

163

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Is every infinite loop space a ring prespectrum?

Published on 11 May 2026 - 3:44

552

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Is this comb-like space contractible?

Published on 01 Apr 2016 - 20:40

78

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Homotpoic and $\#$ of two maps

Published on 02 Apr 2016 - 11:07

226

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Prove $X/A$ is Hausdorff if $A↪X$ is a cofibration

Published on 03 Apr 2016 - 7:26

36

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Why "the line segment in $\mathbb{C}$ joining $f$ and $g$ does not pass through $0$"

Published on 05 Apr 2016 - 14:51

799

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Homotopy is an equivalence relation

Published on 05 Apr 2016 - 15:39

470

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Composition of homotopy classes

Published on 05 Apr 2016 - 17:52

956

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When is $BG$ a topological group?

Published on 25 Mar 2026 - 22:09

44

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Definitions of a homotopy

Published on 05 Apr 2016 - 23:26

194

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Computing fundamental group of the complement to three infinite straight lines, and of complement to $S^1 \cup {Z} $

Published on 31 Mar 2026 - 5:32

752

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Compute the winding number of $\alpha(z)=4z^4+2z^2+1$ and $\alpha(z)=6z^2+7z+2$

Published on 10 Apr 2026 - 20:24

21

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Deformation retraction confusion

Published on 13 Apr 2026 - 12:36

44

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Contractible nullhomotopy

Published on 09 Apr 2026 - 7:48

237

Views

Prove homotopy equivalence of two spaces

Published on 13 Apr 2026 - 19:08

List Question

Show that a set of homotopy classes has a single element

Is every infinite loop space a ring prespectrum?

Is this comb-like space contractible?

Homotpoic and $\#$ of two maps

Prove $X/A$ is Hausdorff if $A↪X$ is a cofibration

Why "the line segment in $\mathbb{C}$ joining $f$ and $g$ does not pass through $0$"

Homotopy is an equivalence relation

Composition of homotopy classes

When is $BG$ a topological group?

Definitions of a homotopy

Computing fundamental group of the complement to three infinite straight lines, and of complement to $S^1 \cup {Z} $

Compute the winding number of $\alpha(z)=4z^4+2z^2+1$ and $\alpha(z)=6z^2+7z+2$

Deformation retraction confusion

Contractible nullhomotopy

Prove homotopy equivalence of two spaces

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