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Derek Holt's user avatar
Derek Holt's user avatar
Derek Holt
  • Member for 14 years, 2 months
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View all questions and answers
answer
46
How much of the ATLAS of finite groups is independently checked and/or computer verified?
Aug 19, 2015
answer
44
Does a finite simple group of order divisible by $60$ have $A_{5}$ as a subgroup?
May 23, 2014
answer
40
How many square roots can a non-identity element in a group have?
Dec 13, 2021
answer
34
Are there any nontrivial ring homomorphisms $M_{n+1}(R)\rightarrow M_n(R)$?
Mar 31, 2013
answer
32
"Squeezing" a finite group between symmetric groups
Oct 28, 2015
question
30
Do two integral matrices generate a free group?
Apr 16, 2019
answer
28
Are there any computational problems in groups that are harder than P?
Jan 23, 2019
question
27
Subdirect product of perfect groups
Sep 11, 2017
answer
27
Algorithm to check is representation irreducible ? Algorithm to decompose the reducible one ?
Nov 3, 2012
answer
26
When is $S_n \times S_m$ a subgroup of $S_p$?
May 16, 2014
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Undelete request, Question 290941
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37
When does every group with order divisible by $n$ have a subgroup of order $n$?
35
Derived subgroup where not every element is a commutator
34
Normal subgroups of infinite symmetric group
31
Looking for a simple proof that groups of order $2p$ are up to isomorphism $\Bbb{Z}_{2p}$ and $D_p$ for prime $p>2$.
31
What is the least $n$ such that it is possible to embed $\operatorname{GL}_2(\mathbb{F}_5)$ into $S_n$?