Geodesic
Normalizers of subsystem subgroups in finite groups of Lie type
Algebra i logika, Tome 47 (2008) no. 1, pp. 3-30

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Finite groups of Lie type form the greater part of known finite simple groups. An important class of subgroups of finite groups of Lie type are so-called reductive subgroups of maximal rank. These arise naturally as Levi factors of parabolic groups and as centralizers of semisimple elements, and also as subgroups with maximal tori. Moreover, reductive groups of maximal rank play an important part in inductive studies of subgroup structure of finite groups of Lie type. Yet a number of vital questions dealing in the internal structure of such subgroups are still not settled. In particular, we know which quasisimple groups may appear as central multipliers in the semisimple part of any reductive group of maximal rank, but we do not know how normalizers of those quasisimple groups are structured. The present paper is devoted to tackling this problem.
Keywords: finite simple group of Lie type, reductive subgroup of maximal rank, subsystem subgroup. 
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     author = {E. P. Vdovin and A. A. Gal't},
     title = {Normalizers of subsystem subgroups in finite groups of {Lie} type},
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     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2008_47_1_a0/}
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E. P. Vdovin; A. A. Gal't. Normalizers of subsystem subgroups in finite groups of Lie type. Algebra i logika, Tome 47 (2008) no. 1, pp. 3-30. http://geodesic.mathdoc.fr/item/AL_2008_47_1_a0/