User Stefan Kohl

6 votes

The "interplay" between additive and multiplicative structure in a field

answered Mar 16, 2013 at 22:43

6 votes

Accepted

Remainders $\quad 1\quad 2\quad $ only

answered Jun 26, 2013 at 10:14

6 votes

How many ways can a given permutation be obtained as a product of k 2-cycles?

answered Nov 4, 2013 at 14:52

6 votes

Deciding if $\mathbb{Z}\ltimes_A \mathbb{Z}^5$ and $\mathbb{Z}\ltimes_B \mathbb{Z}^5$ are isomorphic or not

answered Aug 20, 2020 at 17:16

6 votes

Group of exponential growth always contains a free sub-group?

answered May 1, 2022 at 12:18

6 votes

Which is better for creating tables of group theory info, GAP or MAGMA?

answered Jun 22, 2016 at 16:10

6 votes

Database of integer edge lengths that can form tetrahedrons

answered Oct 1, 2017 at 16:47

6 votes

Accepted

Can a block matrix with at least 3 zero blocks of different size on the diagonal and 1's everywhere else have only integer eigenvalues?

answered Dec 4, 2015 at 19:00

6 votes

Accepted

Finite solvable groups with abelian Fitting subgroup

answered Apr 5, 2016 at 15:01

6 votes

Characterization of finite groups using sum of the orders of their elements

answered Nov 16, 2015 at 20:22

6 votes

p-groups such that the center is contained in many cyclic subgroups

answered Mar 9, 2016 at 22:09

5 votes

Minimal maximal subgroup of the symmetric group

answered Nov 18, 2015 at 19:21

5 votes

Accepted

Subsets of $\mathbb{N}$ whose lower density respects complements

answered Jul 2, 2015 at 9:22

5 votes

Counting matrices over finite fields of a given order

answered Oct 20, 2015 at 12:34

5 votes

Bounds on number of conjugacy classes in terms of number of elements of a group ?

answered Dec 12, 2019 at 13:43

5 votes

Is there a Cayley graph of a non-abelian finite group that is not isomorphic to any Cayley graph of any abelian group?

answered Aug 26, 2013 at 17:46

5 votes

Are residually finite, perfect groups residually alternating?

answered May 17, 2013 at 14:41

5 votes

Fixed space of the square of a symmetric matrix over $\mathbb{F}_2$

answered Mar 11, 2015 at 10:48

5 votes

Groups of order $p(p^2+1)/2$

answered Feb 22, 2014 at 18:01

5 votes

Accepted

Solutions of $rad(\sigma(m))=2rad(m)$

answered Feb 27, 2014 at 18:07

4 votes

Accepted

Higher dimensional Rubik's cube group

answered Nov 7, 2013 at 10:37

4 votes

Groups of order $n$ with a character whose degree is at least $0.8\sqrt{n}$ (say)

answered Feb 15, 2015 at 13:40

4 votes

wreath product and matrix presentation

answered Apr 13, 2013 at 9:33

4 votes

How to quickly determine whether a given natural number is a power of another natural number?

answered Sep 9, 2013 at 20:48

4 votes

Accepted

Solvability of finite groups of order coprime to 15 -- proof without using CFSG?

answered Jul 16, 2013 at 23:21

4 votes

The Frattini subgroup of $D_{\infty}$

answered Sep 27, 2013 at 16:20

4 votes

Examples of unexpected mathematical images

answered Jul 27, 2017 at 19:43

4 votes

Accepted

What is the most efficient way to factor a matrix into a given set of generators?

answered Oct 18, 2015 at 13:44

4 votes

Describe the desired features of a "Mathematics Colloquium"?

answered Jun 13, 2015 at 20:15

4 votes

Accepted

Suprema of lower density of sums and products of sets with lower density 0

answered Jun 4, 2015 at 10:42

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150 Answers

The "interplay" between additive and multiplicative structure in a field

Remainders $\quad 1\quad 2\quad $ only

How many ways can a given permutation be obtained as a product of k 2-cycles?

Deciding if $\mathbb{Z}\ltimes_A \mathbb{Z}^5$ and $\mathbb{Z}\ltimes_B \mathbb{Z}^5$ are isomorphic or not

Group of exponential growth always contains a free sub-group?

Which is better for creating tables of group theory info, GAP or MAGMA?

Database of integer edge lengths that can form tetrahedrons

Can a block matrix with at least 3 zero blocks of different size on the diagonal and 1's everywhere else have only integer eigenvalues?

Finite solvable groups with abelian Fitting subgroup

Characterization of finite groups using sum of the orders of their elements

p-groups such that the center is contained in many cyclic subgroups

Minimal maximal subgroup of the symmetric group

Subsets of $\mathbb{N}$ whose lower density respects complements

Counting matrices over finite fields of a given order

Bounds on number of conjugacy classes in terms of number of elements of a group ?

Is there a Cayley graph of a non-abelian finite group that is not isomorphic to any Cayley graph of any abelian group?

Are residually finite, perfect groups residually alternating?

Fixed space of the square of a symmetric matrix over $\mathbb{F}_2$

Groups of order $p(p^2+1)/2$

Solutions of $rad(\sigma(m))=2rad(m)$

Higher dimensional Rubik's cube group

Groups of order $n$ with a character whose degree is at least $0.8\sqrt{n}$ (say)

wreath product and matrix presentation

How to quickly determine whether a given natural number is a power of another natural number?

Solvability of finite groups of order coprime to 15 -- proof without using CFSG?

The Frattini subgroup of $D_{\infty}$

Examples of unexpected mathematical images

What is the most efficient way to factor a matrix into a given set of generators?

Describe the desired features of a "Mathematics Colloquium"?

Suprema of lower density of sums and products of sets with lower density 0