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Questions on group theory which concern finite groups.
7
votes
1
answer
372
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When is an almost simple group a split extension of its socle?
Here an almost simple group is a finite group whose socle (product of all minimal normal subgroups) is a nonabelian simple group. As an extension of its socle, an almost simple group could be split or …
0
votes
0
answers
224
views
Orbits of stabilizer of two points in a 2-transitive permutation group
I was doing something which needs to know sizes of all orbits of the stabilizer of two points in a 2-transitive permutation group. Since all 2-transitive permutation groups are known ans so are their …
8
votes
3
answers
1k
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Exponent of Sylow $p$-subgroup of classical groups over a field of characteristic $p$
Let $G$ be a classical group of dimension $n$ over $GF(q)$ where $q=p^f$ is a prime power, and $P$ be a Sylow $p$-subgroup of $G$. What is the maximal order of elements, i.e. the exponent, of $P$?
F …
3
votes
2
answers
471
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Maximal soluble subgroups in a parabolic subgroup of finite classical simple group
Let $G$ be a classical simple group over a finite field $GF(q)$ and $P$ a parabolic subgroup of $G$ stabilizing an isotropic subspace. Is the Borel subgroup of $G$ maximal soluble in $P$ and is there …
1
vote
1
answer
104
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The action of graph automorphism of finite symplectic group on maximal subgroups
Let $G=Sp(4,2^f)$ with $f>1$. Based on the facts when $f$ is small, I would feel the following:
$G$ has two conjugacy classes of subgroups isomorphic to $SO^+(4,2^f)$. One is in Aschbacher's class C8 …
0
votes
0
answers
105
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Soluble subgroups of 8-dimensional orthogonal groups over GF(4) transitive on nondegenerate ...
Let $V$ be an $8$-dimensional vector space over $GF(4)$ equipped with a nondegenerate plus type quadratic form, $G$ be an almost simple group with socle $L=\Omega^+(V)$, and $H$ be a soluble subgroup …