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Cohomology of the hyperplane complement of a quaternionic reflection group (2510.18607v1)
Published 21 Oct 2025 in math.RT
Abstract: We compute the graded rank of the cohomology of the hyperplane complement associated with a quaternionic reflection group, and observe that it factors into irreducible factors with positive integer coefficients. For an irreducible group, these irreducible factors are all linear except at most one irreducible quadratic factor, which occurs for precisely three of the exceptional groups.
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