Sebastian Bartling - 15h30 - Br(X)=Br´(X) for separated unions of two affines (after Gabber and Lieblich).
Gabber proved in his thesis the following beautiful theorem: If $X$ is
the separated union of two affine schemes, then the Brauer group
agrees with the cohomological Brauer group. Later Lieblich gave in his
thesis a rather slick new proof using the theory of twisted sheaves.
In this talk I want to sketch Lieblich’s proof and if time permits
I´ll explain why I got interested in this statement.