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Achim Krause's user avatar
Achim Krause's user avatar
Achim Krause
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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
38
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
24
Does the isomorphic of the fundamental groups imply the existence of a mapping inducing an isomorphism?
Nov 10, 2021
23
What is the group of homotopy classes from the 4-torus to the 3-sphere?
Apr 15
22
Is $[X, \_]$ a homology theory?
May 21, 2020
20
Are there any cool applications of the generalized Atiyah-Hirzebruch(-Serre) spectral sequence?
Mar 28, 2014
20
Are there any non-contractible, simply-connected manifolds which are Eilenberg-Mac Lane spaces?
Jan 21