Computation of the divided Frobenius modulo p on the cristalline cohomology of some covering of the porjective line
Abstract
In this paper, we introduce a family of hyper-elliptic curves. For this family we compute the matrix of the divided Frobenius and we obtain general formulas. We use a recent results of Huyghe-Wach : the divided Frobenius coincides with the morphism built by Deligne-Illusie in 1987.
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