Modular analogues of Jordan's theorem for finite linear groups

Details Modular analogues of Jordan's theorem for finite linear groups Modular analogues of Jordan's theorem for finite linear groups

2007-09-20

arxiv.org/abs/0709.3245v1

Mathematics

Group Theory

42 pages. To appear in J. reine angew. Math

Scientific paper

In 1878, Jordan showed that a finite subgroup of GL(n,C) contains an abelian normal subgroup whose index is bounded by a function of n alone. Previously, the author has given precise bounds. Here, we consider analogues for finite linear groups over algebraically closed fields of positive characteristic l. A larger normal subgroup must be taken, to eliminate unipotent subgroups and groups of Lie type and characteristic l, and we show that generically the bound is similar to that in characteristic 0 - being (n+1)!, or (n+2)! when l divides (n+2) - given by the faithful representations of minimal degree of the symmetric groups. A complete answer for the optimal bounds is given for all degrees n and every characteristic l.

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