User Kasper Andersen

16 votes

General bound for the number of subgroups of a finite group

answered Feb 10, 2015 at 13:51

15 votes

Throwing a fair die until most recent roll is smaller than previous one

answered Nov 13, 2020 at 12:50

14 votes

Accepted

Can $\text{Aut}(G)$ be extended to contain $G$?

answered Aug 24 at 12:29

12 votes

Accepted

Elementary $p$-subgroups of a compact Lie group

answered Sep 16, 2020 at 16:34

11 votes

Accepted

For which subgroups the transfer map kills a given element of a group?

answered Oct 8, 2023 at 14:26

11 votes

Accepted

Show a sequence of sums involving Catalan Numbers converges

answered Jun 21, 2018 at 11:20

10 votes

Questions about algorithms for permutation groups

answered Oct 1, 2023 at 10:54

9 votes

Accepted

Why is this group called "The Holomorph of a group"

answered Jan 17, 2015 at 18:33

7 votes

Accepted

higher reciprocity theorems from ratios of Gauss sums

answered Jan 20, 2015 at 19:54

7 votes

Embedding $G$ in a $Z(G)$ extension of $\operatorname{Aut}G$

answered Jan 15, 2015 at 20:26

7 votes

What is the least $n\ge1$ for which there is an $n$-dimensional closed flat manifold with perfect fundamental group?

answered Jan 2, 2023 at 19:14

6 votes

Accepted

Non-vanishing of the Tate-Shafarevich kernel in group cohomology

answered Jun 12, 2016 at 19:29

6 votes

Why, conceptually, does the torus normalizer in $G_2$ split?

answered Aug 1 at 7:38

5 votes

Accepted

Group homology for a metacyclic group

answered Nov 24, 2023 at 13:11

4 votes

Uniform proof that a finite (irreducible real) reflection group is determined by its degrees?

answered Jan 9, 2015 at 12:18

4 votes

Cohomology of the adjoint representation of $\mathrm{SL}_2(k)$

answered Nov 12, 2023 at 9:34

4 votes

Fixed Points of the Weyl Group action on a Maximal Torus and the Center of a Reductive Group

answered Aug 9, 2018 at 9:12

3 votes

Accepted

Probability that k randomly drawn permutations can be arranged to compose to the identity

answered Jul 5, 2021 at 20:19

3 votes

Normal basis with cyclotomic units

answered Apr 2, 2015 at 6:52

3 votes

Accepted

On odd perfect numbers $N$ given in the Eulerian form $N = {q^k}{n^2}$, Part II

answered Apr 10, 2015 at 8:50

3 votes

Compute corestriction map on group cohomology in Magma

answered Nov 9 at 14:29

2 votes

For which number of pairs is it an advantage to start in memory

answered Jan 26, 2018 at 10:11

2 votes

Number of prime divisors with multiplicity in a sum of Gaussian binomial coefficients

answered Apr 25, 2019 at 21:05

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23 Answers

General bound for the number of subgroups of a finite group

Throwing a fair die until most recent roll is smaller than previous one

Can $\text{Aut}(G)$ be extended to contain $G$?

Elementary $p$-subgroups of a compact Lie group

For which subgroups the transfer map kills a given element of a group?

Show a sequence of sums involving Catalan Numbers converges

Questions about algorithms for permutation groups

Why is this group called "The Holomorph of a group"

higher reciprocity theorems from ratios of Gauss sums

Embedding $G$ in a $Z(G)$ extension of $\operatorname{Aut}G$

What is the least $n\ge1$ for which there is an $n$-dimensional closed flat manifold with perfect fundamental group?

Non-vanishing of the Tate-Shafarevich kernel in group cohomology

Why, conceptually, does the torus normalizer in $G_2$ split?

Group homology for a metacyclic group

Uniform proof that a finite (irreducible real) reflection group is determined by its degrees?

Cohomology of the adjoint representation of $\mathrm{SL}_2(k)$

Fixed Points of the Weyl Group action on a Maximal Torus and the Center of a Reductive Group

Probability that k randomly drawn permutations can be arranged to compose to the identity

Normal basis with cyclotomic units

On odd perfect numbers $N$ given in the Eulerian form $N = {q^k}{n^2}$, Part II

Compute corestriction map on group cohomology in Magma

For which number of pairs is it an advantage to start in memory

Number of prime divisors with multiplicity in a sum of Gaussian binomial coefficients