Wang-Sun Formula in GL(Z/2kZ)
Abstract
Wang and Sun proved a certain summatory formula involving derangements and primitive roots of the unit. We study such a formula but for the particular case of the set of affine derangements in GL(Z/2kZ) and its subset of involutive affine derangements in particular; in this last case its value is relatively simple and it is related to even unitary divisors of k.
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