The normal structure of the unipotent subgroup in Lie type groups and its extremal subgroups
Fundamentalʹnaâ i prikladnaâ matematika, Tome 17 (2012) no. 1, pp. 155-168

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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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     author = {V. M. Levchuk and G. S. Suleimanova},
     title = {The normal structure of the unipotent subgroup in {Lie} type groups and its extremal subgroups},
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V. M. Levchuk; G. S. Suleimanova. The normal structure of the unipotent subgroup in Lie type groups and its extremal subgroups. Fundamentalʹnaâ i prikladnaâ matematika, Tome 17 (2012) no. 1, pp. 155-168. http://geodesic.mathdoc.fr/item/FPM_2012_17_1_a8/