时间：2月26日，周三，16:00-17:00  

标题： Estimate for Betti numbers of étale sheaves and applications

报告人：胡昊宇（南京大学）

摘要：In this talk, we discuss a result on upper bounds of all Betti numbers of an étale sheaves on a smooth variety of positive characteristic. This bound only depends on the rank and the Abbes-Saito's logarithmic ramification conductor along the boundary. We will focus on the ideas of the proof. If time permits, we will discuss some applications. This is a joint work with J.-B. Teyssier.