Mathematical Conversations

Topic: Finite fields and the Ax-Grothendieck theorem

Speaker: Remy van Dobben de Bruyn

Affiliation: Veblen Research Instructor, School of Mathematics

Date & Time: Wednesday October 9th, 2019, 6:00pm - 7:30pm

Location: Dilworth Room

The Ax-Grothendieck theorem from the 1960s says that an injective polynomial $f : \mathbb C^n \to \mathbb C^n$ is also surjective. It is one of the first examples of the powerful technique in algebraic geometry of using finite fields to prove results over the complex numbers. We will give an outline of Ax's proof, which is virtually devoid of algebro-geometric input.