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The finite unipotent groups consisting of bireflections

Horan, Katherine, Fleischmann, Peter (2019) The finite unipotent groups consisting of bireflections. Journal of Group Theory, 22 (2). pp. 191-230. ISSN 1433-5883. (doi:10.1515/jgth-2018-0123) (KAR id:68507)


Let k be a field of characteristic p and V a finite dimensional k-vector space. An element g ? GL(V) is called a bireflection if it centralizes a subspace of codimension less than or equal to 2. It is known by a result of Kemper, that if for a finite p-group G ? GL(V) the ring of invariants Sym(V?) G is Cohen-Macaulay, G is generated by bireflections. Although the converse is false in general, it holds in special cases e.g. for particular families of groups consisting of bireflections. In this paper we give, for p > 2, a classification of all finite unipotent subgroups of GL(V) consisting of bireflections. Our description of the groups is given explicitly in terms useful for exploring the corresponding rings of invariants. This further analysis will be the topic of a forthcoming paper.

Item Type: Article
DOI/Identification number: 10.1515/jgth-2018-0123
Subjects: Q Science
Q Science > QA Mathematics (inc Computing science)
Divisions: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Mathematics, Statistics and Actuarial Science
Depositing User: Clair Waller
Date Deposited: 07 Aug 2018 11:08 UTC
Last Modified: 09 Dec 2022 02:30 UTC
Resource URI: (The current URI for this page, for reference purposes)

University of Kent Author Information

Horan, Katherine.

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Fleischmann, Peter.

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