Mathematics
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YCor
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Selected answers:

Centralizers of pairs in monoids of self-maps

https://mathoverflow.net/questions/200353/when-do-two-non-degenerate-quadratic-forms-give-rise-to-isomorphic-lie-algebras/

https://mathoverflow.net/questions/255448/a-question-about-subsets-of-plane/255478#255478 (or: how to apply the notion of commensurating action to a plane geometry question);

https://mathoverflow.net/questions/249071/finitely-generated-soluble-groups-with-uncountably-many-maximal-subgroups/

https://mathoverflow.net/questions/243514/example-of-reflective-subcategory-of-groups-whose-reflector-doesnt-preserve-f/

https://mathoverflow.net/questions/208645/divisors-of-p41-of-the-form-kp1/208652#208652

https://mathoverflow.net/questions/160161/infinitely-many-finitely-generated-groups-having-the-same-cayley-graph/160178#160178

https://mathoverflow.net/questions/145615/do-constructible-sets-have-krull-dimension/146350#146350

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All Questions Answers
Score Newest
answer
40
Under what conditions is the exponential map on a Lie algebra injective?
Dec 29, 2015
answer
15
Does every group of order $n!$ have a subgroup of order $n$?
Aug 10, 2019
answer
13
Burnside group $B(2, 3)$, how to see has $27$ elements and isomorphic to certain group?
Oct 1, 2016
answer
13
Is there a topological group that is connected but not path-connected?
Sep 28, 2013
answer
12
Alternative proofs that $A_5$ is simple
Mar 16, 2013
answer
11
Let $H$ be a group, if its abelianization is $\mathbb{Z}_2$ does this mean that $H$ has torsion?
Oct 30, 2019
answer
10
Riemannian metrics on homogeneous spaces
Jan 24, 2016
answer
10
Sort-of-simple non-Hopfian groups
Oct 26, 2016
answer
10
Is every finite group of isometries a subgroup of a finite reflection group?
Sep 1, 2014
answer
10
Do you know this finitely presented group on two generators?
Dec 9, 2020
Top network posts
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72
In a topological space if there exists a loop that cannot be contracted to a point does there exist a simple loop that cannot be contracted also?
62
How can a mathematician handle the pressure to discover something new?
50
Is there a smallest group containing all finite groups?
40
Are infinite groups in which most elements have order $\leq 2$ commutative?
37
Bourbaki's definition of the number 1

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