The Stable Adjunction Map on Gorenstein Varieties.
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.
In this paper we study the global structure of projective threefolds X whose anticanonical bundle -KX is nef.
Dans cet article, nous étudions le problème de l’existence de polynômes de Darboux dans pour la dérivation .