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AG : Carolina Araujo (IMPA, Brésil) : « Birational geometry of Calabi-Yau pairs »
Bâtiment Fermat, salle 4205Abstract: Consider the following problem, originally posed by Gizatullin: "Which automorphisms of a smooth quartic K3 surface in $P^3$ are induced by Cremona transformations of the ambient space?'' When S is a smooth quartic surface in $P^3$, the pair ($P^3$,S)