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The set of functions which map convergent series to convergent series

real-analysis sequences-and-series analysis convergence asked Mar 6, 2012 at 5:09

math.stackexchange.com

15 votes

Proof that a certain subset of the reals is not a ring

abstract-algebra ring-theory examples-counterexamples asked Feb 25, 2014 at 16:30

math.stackexchange.com

11 votes

Modular subgroup lattice in GAP

group-theory lattice-orders computer-algebra-systems gap asked Mar 24, 2013 at 19:22

math.stackexchange.com

10 votes

If $G/Z$ is a product of $p$-groups...

group-theory finite-groups asked Sep 20, 2011 at 20:53

math.stackexchange.com

10 votes

A multiple integral

integration multivariable-calculus asked Aug 24, 2011 at 20:19

math.stackexchange.com

10 votes

Reference for the subgroup structure of $\rm{PSL}_2(q)$

group-theory reference-request finite-groups asked Mar 8, 2012 at 21:00

math.stackexchange.com

9 votes

Sufficient condition for complementation of abelian normal subgroup

gr.group-theory finite-groups asked Dec 5, 2019 at 21:43

mathoverflow.net

8 votes

Big changes in engine's evaluation after considerable time

engines evaluation asked Nov 25, 2020 at 23:16

chess.stackexchange.com

8 votes

Defining a recursive sequence

recursion asked May 19, 2012 at 11:03

mathematica.stackexchange.com

8 votes

Counting subspaces

reference-request co.combinatorics vector-spaces q-analogs asked Jul 19, 2015 at 13:03

mathoverflow.net

Top Answers

Does the list of "number of groups of order $n$" contain every natural number?

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$G$ is a group of order $60$. Will $G$ always contain a subgroup of order $6$?

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The product of the commutator subgroup with any subgroup

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Find the order of $\operatorname{Aut}(G)$.

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Smallest subgroup generated by a subset of a group.

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Is it true that if $H_1$ and $H_2$ are isomorphic cyclic subgroups of $G$, then $G/H_1\cong G/H_2$?

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Is a finite centerless metabelian group always a semidirect product of two abelian groups?

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Uniqueness of maximal subgroup and order being a power of a prime

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Examples of great mathematical writing

mathoverflow.net

$G$ is nilpotent iff for any maximal subgroups $M$ and $N$ of $G$, $MN=NM$.

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What's an example of a finite, non-abelian, non-simple group that is *not* semidirectly reducible?

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Does a group of order $400$ always have a subgroup of order $200$?

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Schreier's Conjecture

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Cyclic normal subgroup of perfect group is in the center

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If every proper subgroup of a finite abelian group $G$ is cyclic, then $G$ is cyclic.

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Examples of self-normalizing subgroups?

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To break mental health condition to potential new advisor?

academia.stackexchange.com