37 research outputs found

    Low incidence of SARS-CoV-2, risk factors of mortality and the course of illness in the French national cohort of dialysis patients

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    Guiding center simulations on curvilinear grids

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    An Ingham type proof for a bigrid observability theorem

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    It is well known that classical semi-discretization of the wave equation do not lead to uniform observability. One remedy is to use a two-grid method; this was at first analysed by Negreanu and Zuazua. We propose here an Ingham type approach to study this problem. The main difficulty is to handle with eigenvalues, coming from the discretization, which do not have a uniform gap
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