Because of the attack on the computer network of the University of Duisburg-Essen, some content (in particular some image files) cannot be accessed because it is stored on central servers of the university.

Andrew Kresch will speak on

Brauer groups and formal gerbes

In his foundational works on Brauer groups of schemes, Grothendieck raised
a question about the behavior of the Brauer group in the setting of a
scheme, proper over a complete DVR. We address this question using
gerbes on the associated formal scheme. This is work in progress,
joint with Siddharth Mathur.