Our weekly Seminar "Algebra and Geometry" takes place on
Tuesdays from 10:30 to 12:00 a.m., Mathematical Institute (Spiegelgasse 1, ground floor) with tea and coffee at 10:10 a.m. (on the 6th floor of Spiegelgasse 1).
|Sep 11-12 (Mon-Tue)||Dijon-Basel Meeting in Algebraic Geometry (in Dijon)|
Anne Lonjou (Basel) - Cremona group and hyperbolic spaces
The Cremona group is the group of birational transformations of the projective plane. It acts on a hyperbolic space which is an infinite dimensional version of the hyperboloid model of H^n. This action is the main recent tool to study the Cremona group. After defining it, we will study its Voronoï tesselation, and describe some graphs naturally associated with this construction. Finally we will discuss which of these graphs are Gromov-hyperbol<wbr style="font-family: Helvetica; font-size: 12px; " />ic.
|Sep 26|| |
|Sep 28 (Thursday)||Verteidigung von Christian Urech|
Yves de Cornulier (Lyon 1)
Frederic Han (Paris 7) - On birational transformations of P3 of low degree.
After a short introduction to birational transformations of a projective space, we will focus on the case of P3. Few is known about birational transformations of P3 and the case of degree 3 is already difficult. To explain how things differ in larger degree it is natural to look at transformations of bidegree (4,4). In this talk we detail families of examples in degree 3 and bidegree (4,4) to illustrate this opposition. (joint work with J. Déserti)
Konstantin Shramov (HSE Moscow)
Oct 20 (Friday)
EPFL-Basel Meeting in Birational Geometry (in EPFL)
BASEL-EPFL Meeting in Birational Geometry (in Basel)
Egor Yasinsky (Moscow)
Giulo Codogni (EPFL)
Information about former semesters can be found here.