Derek Holt's user avatar
Derek Holt's user avatar
Derek Holt's user avatar
Derek Holt
  • Member for 13 years, 5 months
  • Last seen this week
11 votes
Accepted

How to have MAGMA work with subgroup of ATLASGroups?

9 votes

A question on permutation groups

15 votes
Accepted

Does a fibre product of a group $G$ with itself have a subgroup isomorphic to $G$?

18 votes
Accepted

Is it possible for a direct product to be isomorphic to the Zappa–Szép product?

8 votes
Accepted

Calculating the centralizer of a subgroup of $\mathrm{GL}(n, \mathbb{Z})$

9 votes
Accepted

is the embedding $\mathrm{Sp}_{2m}(p)\leqslant S_{p^m-1}$ possible?

6 votes
Accepted

The automorphism group of $2^{2n}{:}Sp_{2n}(2)$

3 votes
Accepted

Assigning a finite number, $n(G)$, to a finite group $G$ with this property

10 votes
Accepted

Checking for a normal p-complement with a computer

4 votes
Accepted

Orbit sizes of $G=\operatorname{SO}^{+}_{2n}(2)$

14 votes
Accepted

If G is an almost simple group, then Aut(G) is complete?

1 vote

The property of subgroups of a finite solvable group

12 votes
Accepted

Find an example where a subset of “inverse fixed points“ is not a subgroup

4 votes
Accepted

Normalisers and stabilisers in classical groups $\operatorname{PGL}_{4}$

6 votes

Does a perfect $4^{11}\cdot M_{24}$ exist?

3 votes
Accepted

Relators of the "most general" 2x2 matrix Hurwitz group

9 votes

"Novelty" maximal subgroups in $S_n$

5 votes
Accepted

Subgroup of a group with length 3 relators

8 votes
Accepted

Splitting of a finite group with no abelian subfactor in composition series

8 votes

A curious group presentation

7 votes

Irreducible deleted permutation module for a finite group

4 votes

Conjugacy classes of $PSL_2(11)$ and $PGL_2(11)$ in $Aut(HN)$

1 vote

Extensions containing the Schur cover II

3 votes
Accepted

The center of Sylow subgroups

7 votes
Accepted

Is there a classification of homomorphisms $S_n \to S_{n+k}$ for small $k$?

3 votes

The intersection of product of Sylow subgroups

1 vote
Accepted

Algorithm to find a minimal normal subgroup of given group $G$ by matrix group representation

5 votes
Accepted

Aschbacher classes for compact simple group

7 votes

If $K\rtimes \mathbb{Z}$ is a finitely generated group but $K$ isn't, must the fixed points of $1_\mathbb{Z}$ be a finitely generated group?

40 votes

How many square roots can a non-identity element in a group have?

1
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14