Even-dimensional orthogonal groups as amalgams of unitary groups

Autor: Sergey Shpectorov, Ralf Gramlich, Corneliu Hoffman, Werner Nickel
Rok vydání: 2005
Předmět:
Zdroj: Journal of Algebra. 284(1):141-173
ISSN: 0021-8693
DOI: 10.1016/j.jalgebra.2004.09.025
Popis: This article is part of the program described in [C.D. Bennett, R. Gramlich, C. Hoffman, S. Shpectorov, Curtis–Phan–Tits theory, in: A.A. Ivanov et al. (Eds.), Groups, Combinatorics and Geometry, Proceedings of the Durham Conference on Groups and Geometries, 2001, World Scientific, Singapore, 2003, pp. 13–29]. We provide presentations of even-dimensional orthogonal groups, a characterization of even-dimensional orthogonal groups by certain amalgams of subgroups isomorphic to SU ( 2 , q 2 ) , SU ( 3 , q 2 ) , and SU ( 2 , q 2 ) × SU ( 2 , q 2 ) over any finite field, and a classification of related amalgams. The results are obtained by diagram geometry, geometric covering theory, and analysis of amalgams.
Databáze: OpenAIRE