Achim Krause

Member for 11 years, 3 months
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at.algebraic-topology

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Answers

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58

Is there any use for $\sin(\sin x)$?

Feb 1, 2021

38

Simply-connected rational homology spheres

Aug 13, 2015

37

If $\Omega X \simeq \Omega Y$ then is $X \simeq Y$ for $X,Y$ simply connected?

Nov 22, 2019

32

What is the group of pointed homotopy classes of maps from $S^3 \times S^3$ to $S^3$?

Mar 14, 2014

29

What should I call a "differential" which cubes, rather than squares, to zero?

Mar 24, 2020

Questions

20

Are there any cool applications of the generalized Atiyah-Hirzebruch(-Serre) spectral sequence?

Mar 28, 2014

1

Factoring cyclotomic polynomials over quadratic subfield

Apr 2, 2020

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at.algebraic-topology

482

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42

posts

homotopy-theory

215

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23

posts

stable-homotopy

109

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10

posts

gt.geometric-topology

89

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7

posts

ct.category-theory

80

Score

11

posts

Reputation

+155

What does Robert Stong mean when he says $H^*(MO(k))$ is a free Steenrod algebra in dimension less than $2k$?

+30

Cohomology version of Moore space

+70

Formula for compositions of Steenrod squares that produce a form in the top degree

+10

Is every map from a simplicial complex to a sphere homotopic to a simplicial map to the boundary of a k-simplex?

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