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Comparison of prismatic cohomology and derived de Rham cohomology

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arxiv 2012.14064 v3 pith:Y22I3E4W submitted 2020-12-28 math.AG math.NT

classification math.AGmath.NT
keywords cohomologycomparisonderivedprismaticrhamtorsionactionsadic
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abstract

We establish a comparison isomorphism between prismatic cohomology and derived de Rham cohomology respecting various structures, such as their Frobenius actions and filtrations. As an application, when $X$ is a proper smooth formal scheme over $\mathcal O_K$ with $K$ being a $p$-adic field, we improve Breuil--Caruso's theory on comparison between torsion crystalline cohomology and torsion \'etale cohomology.

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  1. An integral comparison of crystalline and de Rham cohomology

    math.NT 2025-07 conditional novelty 6.0 of 10

    The paper proves an integral, coefficient-version of the Berthelot-Ogus comparison between de Rham and crystalline cohomology using stacky prismatic cohomology and a Dwork-trick argument.

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