James Freitag : An Invariant of Difference Field Extensions

Posted by , part of the Logic Seminar.

At

Nov. 30, 2010, 4 p.m.

In

SEO 612

Abstract

This talk is a continuation of the past two talks on "The Structure of totally disconnected, locally compact groups" by G. Willis. In particular, we will talk about an application in the recent paper, "An invariant for difference field extensions." http://arxiv.org/PS_cache/arxiv/pdf/0902/0902.0844v3.pdf I will explain what the group theoretic notion of tidy means when applied to automorphism groups of difference field extensions. Then we will discuss what sort of difference field extensions have tidy automorphism groups and explain why these are useful.