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arxiv: 1701.04261 · v3 · pith:363GXY3Jnew · submitted 2017-01-16 · 🧮 math.AG

Troisi\`eme groupe de cohomologie non ramifi\'ee des hypersurfaces de Fano

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keywords hypersurfacescorpsfanofieldcohomologiefinifinitepour
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We establish the vanishing of the third unramified cohomology group for many types of Fano hypersurfaces in projective space over an algebraically closed field of arbitrary characteristic, and over a finite field. For cubic hypersurfaces over a finite field, the case of fourfolds remains open. --- Sur un corps alg\'ebriquement clos et sur un corps fini, on \'etablit de nouveaux r\'esultats d'annulation pour la cohomologie non ramifi\'ee de degr\'e 3 pour de nombreux types d'hypersurfaces de Fano. Le cas des hypersurfaces cubiques de dimension 4 sur un corps fini reste ouvert.

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