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St. Petersburg Mathematical Journal

ISSN 1547-7371(online) ISSN 1061-0022(print)



Transvections in subgroups of the general linear group containing a nonsplit maximal torus

Author: V. A. Koibaev
Translated by: P. P. Petrov
Original publication: Algebra i Analiz, tom 21 (2009), nomer 5.
Journal: St. Petersburg Math. J. 21 (2010), 731-742
MSC (2010): Primary 20G15
Published electronically: July 14, 2010
MathSciNet review: 2604563
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Abstract: The objects of the study are intermediate subgroups of the general linear group $ \mathrm{GL}(n,k)$ of degree $ n$ over an arbitrary field $ k$ that contain a nonsplit maximal torus associated with an extension of degree $ n$ of the ground field $ k$ (minisotropic torus). It is proved that if an overgroup of a nonsplit torus contains a one-dimensional transformation, then it contains an elementary transvection at some position in every column, and similarly for rows. This result makes it possible to associate net subgroups with groups of the above class and thus forms a base for their further study. This step is motivated by extremely high complexity of the lattice of intermediate subgroups. For a finite field, the lattice of overgroups of a nonsplit maximal torus is essentially determined by subfields intermediate between the ground field and its extension (G. M. Seitz, W. Kantor, R. Dye). Nothing like that holds true for an infinite field; even for the group $ \mathrm{GL}(2,k)$ this lattice has much more complicated structure and essentially depends on the arithmetic of the ground field $ k$ (Z. I. Borewicz, V. P. Platonov, Chan Ngoc Hoi, the author, and others).

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Additional Information

V. A. Koibaev
Affiliation: Algebra and Geometry Department, K. L. Khetagurov North-Ossetian State University, Vatutin Street 46, Vladikavkaz 362025, Russia

Keywords: Overgroups, intermediate subgroups, nonsplit tori, maximal torus, transvection
Received by editor(s): December 18, 2008
Published electronically: July 14, 2010
Article copyright: © Copyright 2010 American Mathematical Society