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Top Questions
22
votes
Essential theorems in group (co)homology
big-list
homological-algebra
at.algebraic-topology
group-cohomology
asked Jan 21, 2010 at 13:46
mathoverflow.net
16
votes
Smooth classifying spaces?
gn.general-topology
homology
at.algebraic-topology
asked Oct 18, 2009 at 23:40
mathoverflow.net
14
votes
When is $\pi_0$ a group?
algebraic-topology
asked Mar 29, 2014 at 23:05
math.stackexchange.com
13
votes
Real analysis has no applications?
real-analysis
soft-question
teaching
asked Jun 3, 2010 at 12:37
mathoverflow.net
12
votes
Cite articles or book where I first found the result?
soft-question
citations
publishing
asked May 15, 2011 at 3:57
mathoverflow.net
8
votes
Differentials in the Lyndon-Hochschild spectral sequence
at.algebraic-topology
homological-algebra
homology
asked Oct 15, 2009 at 12:17
mathoverflow.net
8
votes
"Surprising" categorical equivalences
ct.category-theory
big-list
asked Mar 6, 2011 at 3:50
mathoverflow.net
8
votes
Examples of the varying strengths of topological invariants
at.algebraic-topology
homology
cohomology
soft-question
big-list
asked Jan 2, 2010 at 18:21
mathoverflow.net
7
votes
Geometric interpretation of the fundamental groupoid
at.algebraic-topology
groupoids
big-picture
intuition
asked Jun 8, 2010 at 16:59
mathoverflow.net
7
votes
Crossed module structure on homotopy groups
at.algebraic-topology
homotopy-theory
ct.category-theory
asked Aug 18, 2010 at 15:56
mathoverflow.net
Top Answers
127
Intuition of the meaning of homology groups
math.stackexchange.com
27
What's a groupoid? What's a good example of a groupoid?
mathoverflow.net
17
Intuition for Group Cohomology
mathoverflow.net
13
Cocktail party math
mathoverflow.net
11
Good textbooks on combinatorics for self-study
math.stackexchange.com
7
Estimating the number of clusters
mathoverflow.net
7
References for homotopy colimit
mathoverflow.net
7
Where have you used computer programming in your career as an (applied/pure) mathematician?
mathoverflow.net
6
rational homology
math.stackexchange.com
6
Why is this tensor product equal to $\overline{\mathbb{Q}}^n$?
math.stackexchange.com
6
Nice examples of groups which are not obviously groups
math.stackexchange.com
6
Motivation for algebraic K-theory?
mathoverflow.net
5
A topology which cannot be obtained by a distance function
math.stackexchange.com
5
Why aren't there more classifying spaces in number theory?
mathoverflow.net
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