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The main result of this paper implies that if an abelian variety over a field has a maximal isotropic subgroup of -torsion points all of which are defined over , and , then the abelian variety has semistable reduction away from . This result can be viewed as an extension of Raynaud’s theorem that if an abelian variety and all its -torsion points are defined over a field and , then the abelian variety has semistable reduction away from . We also give information about the Néron models...
It is known that in the case of hyperelliptic curves the Shafarevich conjecture can be made effective, i.e., for any number field and any finite set of places of , one can effectively compute the set of isomorphism classes of hyperelliptic curves over with good reduction outside . We show here that an extension of this result to an effective Shafarevich conjecture for Jacobians of hyperelliptic curves of genus would imply an effective version of Siegel’s theorem for integral points on...
We give some easy necessary and sufficient criteria for twists of abelian varieties by Artin representations to be simple.
Ce texte est un survey concernant la question du rang d’une variété abélienne sur un corps de fonctions en une variable sur un corps de base . Il s’agit non seulement de discuter une borne supérieure pour ce rang, mais aussi d’étudier le comportement de cette borne si on prend une extension abélienne finie de . On se demande aussi : que se passe-t-il quand on enlève cette dernière hypothèse ? Dans un cas particulier, on discute de la validité d’un analogue du théorème de Lang-Néron. Pour...
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