Abstract
We study the normal structure of the unipotent radical U of a Borel subgroup in a Lie type group over a field K. Thus, all maximal Abelian normal subgroups in U are described. This gives a new solution of C. Parker and P. Rowley’s problem about extremal subgroups in U and the description in finite groups U of the large normal (and, as proved, also normal large) Abelian subgroups.
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Translated from Fundamentalnaya i Prikladnaya Matematika, Vol. 17, No. 1, pp. 155–168, 2011/12.
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Levchuk, V.M., Suleimanova, G.S. The normal structure of the unipotent subgroup in Lie type groups and its extremal subgroups. J Math Sci 185, 448–457 (2012). https://doi.org/10.1007/s10958-012-0927-8
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DOI: https://doi.org/10.1007/s10958-012-0927-8