Hélène Esnault: Lefschetz theorems in Arithmetic Geometry
Tid: On 2017-02-22 kl 13.15
Plats: Room 3418, KTH
Medverkande: Hélène Esnault, Freie Universität, Berlin
We survey the existing Lefschetz theorems in presence of ramification for connections, for lisse l-adic sheaves and for F-overconvergent isocrystals. We shall motivate those theorems by Deligne's finiteness theorem and Drinfeld's companions over a finite field.