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Ci-dessous, les différences entre deux révisions de la page.

--- fables [2020/03/09 15:33] – weronika
+++ fables [2020/04/26 16:45] – weronika
@@ Ligne 4: / Ligne 4: @@
 The normal starting time of this seminar is 16.30 on Monday.
-, Monday, March 23, 16:30, Battelle, Maciej Zdanowicz (EPFL)
+, Tuesday, April 7, 17:00, Virtual seminar (EDGE seminar) Grigory Mikhalkin (Geneva)
-**Beauville--Bogomolov decomposition in characteristic p>0**
+https://zoom.us/j/870554816?pwd=bERmR0ZQTitYNXJ1aFZLckxzeXZJZz09
+Meeting ID: 870 554 816 Password: 014504
-The classical Beauville--Bogomolov decomposition is a structural result concerning complex varieties with trivial first Chern class.  It states that such varieties can be decomposed, up to a finite étale cover, into a product of simpler building blocks: abelian, Calabi--Yau  and hyperkähler varieties.  In the talk, I will first briefly explain how varieties with trivial first Chern class arise in algebraic geometry, and how to obtain the decomposition theorem using differential geometry methods.  Then I will present a recent result, obtained in a joint work with Zsolt Patakfalvi (EPFL), providing a weak version of the decomposition in characteristic p>0 geometry where standard analytic techniques are not available.
+**Area in real K3-surfaces**
+Real locus of a K3-surfaces is a multicomponent topological surface. The canonical class provides an area form on these components (well defined up to multiplication by a scalar). In the talk we'll explore inequalities on total areas of different components as well a link between such inequalities and a class of real algebraic curves called simple Harnack curves. Based on a joint work with Ilia Itenberg.
+----
+, Monday, March 31, 17:00, Virtual seminar, Vladimir Fock (Strasbourg)
+https://unige.zoom.us/j/737573471
+Meeting ID: 737 573 471
+**Higher measured laminations and tropical curves**
+We shall define a notion of a higher lamination - a graph embedded
+into a Riemann surface with edges coloured by generators of an affine
+Weyl group. This notion generalises the notion of the ordinary
+integral measured lamination and on the other hand of a tropical
+curve and can be constructed out of a integral Lagrangian submanifold
+of the cotangent bundle.
 ----
-, Monday, March 16, 16:30, Battelle, Alexander Veselov (Loughborough University)[POSTPONED TILL APRIL]
+, Monday, March 16, 16:30, Battelle, Alexander Veselov (Loughborough University)[POSTPONED]
 **On integrability, geometrization and knots**