Speaker：Yong Hu（Shanghai Jiao Tong University）

Time：2023-3-22, 09:00

Location：Conference Room 111 at Experiment Building at Haiyun Campus

Abstract:

The classical Noether-Severi inequality is an important inequality in the classification of irregular surfaces of general type. In this talk, I will introduce the optimal Noether-Severi inequality vol(X) \ge \frac{4}{3} \chi(\omega_{X}) for all smooth and irregular 3-folds $X$ of general type over C. For those 3-folds X attaining the equality, I will describe their canonical models and show that the topological fundamental group \pi_1(X) \simeq \ZZ^2. This is a joint work with Tong Zhang.