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Le groupe de Brauer non ramifié sur un corps global de caractéristique positive (The unramified Brauer group over a global field of positive characteristic)

Published 21 Mar 2013 in math.AG | (1303.5221v2)

Abstract: En utilisant un th\'eor`eme de Gabber sur les alt\'erations, on d\'emontre un r\'esultat d\'ecrivant la partie de torsion premi`ere `a $p$ du groupe de Brauer non ramifi\'e d'une vari\'et\'e $V$ lisse et g\'eom\'etriquement int`egre sur un corps global de caract\'eristique $p$ au moyen de l'\'evaluation des \'el\'ements de $\Br V$ sur ses points locaux. Using a theorem of Gabber on alterations, we prove a result describing the prime-to-$p$ torsion part of the unramified Brauer group of a smooth and geometrically integral variety $V$ over a global field of characteristic $p$ by evaluating the elements of $\Br V$ at its local points.

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