%0 Journal Article
%T An upper bound on the exceptional characteristics for Lusztig's character formula
%A Peter Fiebig
%J Mathematics
%D 2008
%I arXiv
%X We develop and study a Lefschetz theory in a combinatorial category associated to a root system and derive an upper bound on the exceptional characteristics for Lusztig's formula for the simple rational characters of a reductive algebraic group. Our bound is huge compared to the Coxeter number. It is, however, given by an explicit formula.
%U http://arxiv.org/abs/0811.1674v2