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For a proper local embedding between two Deligne-Mumford stacks and , we find, under certain mild conditions, a new (possibly non-separated) Deligne-Mumford stack , with an etale, surjective and universally closed map to the target , and whose fiber product with the image of the local embedding is a finite union of stacks with corresponding etale, surjective and universally closed maps to . Moreover, a natural set of weights on the substacks of allows the construction of a universally closed...
We describe the tautological ring of the moduli space of stable -pointed curves of genus one of compact type. It is proven that it is a Gorenstein algebra.
Dans ces notes, on présente un théorème de zéros, dû à Amoroso et David, qui généralise le résultat principal de [Phi96] et constitue une version avec multiplicités, dans le cadre élargi des groupes algébriques commutatifs, du lemme de zéros de [AD03]. Cet énoncé s’avère utile dans certaines approches diophantiennes du problème de Bogomolov effectif sur les variétés abéliennes (cf. [Gal10]).
Nous donnons une courte démonstration de ce que les classes des variétés singulières définies par Marie-Hélène Schwartz au moyen des « champs radiaux » coïncident avec la notion fonctorielle définie par Robert MacPherson.
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