Hélène Esnault: Lefschetz theorems in Arithmetic Geometry
Time: Wed 2017-02-22 13.15
Lecturer: Hélène Esnault, Freie Universität, Berlin
Location: Room 3418, KTH
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.