User Jesper Grodal

33 votes

Accepted

Why are Schur multipliers of finite simple groups so small?

answered Jul 22, 2013 at 15:04

20 votes

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Definition of "finite group of Lie type"?

answered Sep 25, 2013 at 15:35

14 votes

A homotopy commutative diagram that cannot be strictified

answered Dec 8, 2011 at 11:49

14 votes

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$A_{\infty}$-structure on closed manifold

answered Feb 18, 2016 at 21:30

14 votes

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Homotopy properties of Lie groups

answered Mar 10, 2022 at 11:13

13 votes

Can both G and BG be finite CW complexes?

answered Oct 10, 2013 at 23:11

12 votes

Weight lattice and the fundamental group

answered Jan 30, 2012 at 10:27

12 votes

Dimension of a homotopy type

answered Mar 2, 2016 at 13:42

12 votes

Accepted

When is the cohomology of a space Ext(k,k)?

answered May 1, 2015 at 9:58

11 votes

Accepted

Homology of manifold with action of group

answered May 16, 2015 at 10:50

11 votes

When is the quotient by an $n$-fold loop space an $m$-fold loop space?

answered Sep 9, 2015 at 10:07

11 votes

Relation between groups and classifying spaces

answered Jan 27, 2013 at 13:06

10 votes

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How to find more (finite almost simple) groups with a given Sylow subgroup

answered Jun 5, 2010 at 19:17

8 votes

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Computing the homology groups of spaces in a fibration

answered Feb 15, 2012 at 9:03

6 votes

When are all centralizers in a Lie group connected?

answered Mar 26, 2012 at 12:52

6 votes

Why localize spaces with respect to homology?

answered Jul 10, 2014 at 11:32

4 votes

Accepted

Homology of homotopy fixed point spaces

answered Mar 16, 2011 at 21:48

Stack Exchange Network

17 Answers

Why are Schur multipliers of finite simple groups so small?

Definition of "finite group of Lie type"?

A homotopy commutative diagram that cannot be strictified

$A_{\infty}$-structure on closed manifold

Homotopy properties of Lie groups

Can both G and BG be finite CW complexes?

Weight lattice and the fundamental group

Dimension of a homotopy type

When is the cohomology of a space Ext(k,k)?

Homology of manifold with action of group

When is the quotient by an $n$-fold loop space an $m$-fold loop space?

Relation between groups and classifying spaces

How to find more (finite almost simple) groups with a given Sylow subgroup

Computing the homology groups of spaces in a fibration

When are all centralizers in a Lie group connected?

Why localize spaces with respect to homology?

Homology of homotopy fixed point spaces