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  • Cohomology for Picard-Vessi...
    Tsui, Man Cheung; Wang, Yidi

    Journal of algebra, 11/2024, Volume: 658
    Journal Article

    We introduce a cohomology theory that classifies differential objects that arise from Picard-Vessiot theory, using differential Hopf-Galois descent. To do this, we provide an explicit description of Picard-Vessiot theory in terms of differential torsors. We then use this cohomology to give a bijective correspondence between differential objects and differential torsors. As an application, we prove a universal bound for the differential splitting degree of differential central simple algebras.