

On K3 surfaces with non-elementary hyperbolic automorphism group
By Keiji Oguiso


Starting with the Gauss-Bonnet formula: rigidity phenomena on bounded symmetric domains
By Ngaiming Mok
Appears in collections : Rational points and algebraic geometry / Points rationnels et géométrie algébrique, Rational points and algebraic geometry / Points rationnels et géométrie algébrique
The classical Bertini irreducibility theorem states that if $X$ is an irreducible projective variety of dimension at least 2 over an infinite field, then $X$ has an irreducible hyperplane section. The proof does not apply in arithmetic situations, where one wants to work over the integers or a finite fields. I will discuss how to amend the theorem in these cases (joint with Bjorn Poonen over finite fields).