On the vanishing ranges for the cohomology of finite groups of Lie type II

Details On the vanishing ranges for the cohomology of finite groups of Lie type II On the vanishing ranges for the cohomology of finite groups of Lie type II

2011-12-11

arxiv.org/abs/1112.2367v1

Mathematics

Group Theory

Scientific paper

The computation of the cohomology for finite groups of Lie type in the describing characteristic is a challenging and difficult problem. In earlier work, the authors constructed an induction functor which takes modules over the finite group of Lie type to modules for the ambient algebraic group G. In particular this functor when applied to the trivial module yields a natural G-filtration. This filtration was utilized in the earlier work to determine the first non-trivial cohomology class when the underlying root system is of type A_{n} or C_{n}. In this paper the authors extend these results toward locating the first non-trivial cohomology classes for the remaining finite groups of Lie type (i.e., the underlying root system is of type B_{n}, C_{n}, D_{n}, E_{6}, E_{7}, E_{8}, F_{4}, and G_{2}) when the prime is larger than the Coxeter number.

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