Deformations of Principal Bundles on the Projective Line.
Degeneration of the Kummer sequence in characteristic
We study a deformation of the Kummer sequence to the radicial sequence over an -algebra, which is somewhat dual for the deformation of the Artin-Schreier sequence to the radicial sequence, studied by Saidi. We also discuss some relations between our sequences and the embedding of a finite flat commutative group scheme into a connected smooth affine commutative group schemes, constructed by Grothendieck.
Démonstration de la conjecture de Mumford
Die maximalen arithmetisch definierten Untergruppen zerfallender einfacher Gruppen.
Dualitätssatz für endliche kommutative Gruppenschemata über Kongruenzfunktionenkörpern.
Dualité sur un corps local à corps résiduel algébriquement clos
Duality in the Flat Cohomology of Curves.