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<dc:title xml:lang="fr">Descente de Cartier et torseurs sous le noyau de Frobenius</dc:title>
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<dc:subject xml:lang="fr">Descente de Cartier</dc:subject>
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<tef:elementdEntree autoriteExterne="031441610" autoriteSource="Sudoc">Théorie des torseurs</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="031488951" autoriteSource="Sudoc">Principe de dualité (mathématiques)</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="031719090" autoriteSource="Sudoc">Algèbres de Frobenius</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Dans cette thèse, on s'intéresse à la descente de Cartier en vue d'une application à la caractérisation de G^F-torseurs fppf en termes de formes différentielles, où G^F est le noyau de Frobenius d'un groupe lisse affine G sur un corps de caractéristiques p≻0. Pour cela nous utilisons la dualité de Tannaka pour montrer une version analogue du théorème de descente de Cartier pour les torseurs. Ce dernier nous permet d'avoir une caractérisation de ces G^F-torseurs, qui généralise des résultats déjà connus pour les cas µp et αp.</dcterms:abstract>
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