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Levi-spherical Schubert varieties
Published 30 Apr 2023 in math.RT, math.AG, and math.CO | (2305.00555v2)
Abstract: We prove a short, root-system uniform, combinatorial classification of Levi-spherical Schubert varieties for any generalized flag variety $G/B$ of finite Lie type. We apply this to the study of multiplicity-free decompositions of a Demazure module into irreducible representations of a Levi subgroup.
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