Abstract
We show that the decomposition matrix of unipotent $\ell $-blocks of a finite reductive group $\mathbf {G}(\mathbb {F}_q)$ has a unitriangular shape, assuming $q$ is a power of a good prime and $\ell $ is very good for $\mathbf {G}$. This was conjectured by Geck in 1990 as part of his PhD thesis. We establish this result by constructing projective modules using a modification of generalised Gelfand–Graev characters introduced by Kawanaka. We prove that each such character has at most one unipotent constituent which occurs with multiplicity one. This establishes a 30 year old conjecture of Kawanaka.
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