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In 2020, Brunat-Dudas-Taylor showed that the decomposition matrix of unipotent -blocks of a nite reductive group in good characteristic has unitriangular shape, under some conditions on the prime , in particular being good. We extend this result to bad by adapting their proof to include the -special classes dened by Chaneb.
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M.P. Roth (2024) studied this question.
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