The decomposition of permutation module for infinite Chevalley groups

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Let G be a connected reductive group defined over Fq,the finite field with q elements.Let B be a Borel subgroup defined over Fq.In this paper,we completely determine the composition factors of the induced module M(tr) =kG (⊕)kB tr (where tr is the trivial B-module) for any field k.
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