## Geometry Seminar

**Date:** November 14, 2019

**Time:** 4:00PM - 5:00PM

**Location:** BLOC 628

**Speaker:** M. Michalek, MPI Leipzig

**Title:** *C^*-actions, ML-degree and various Grassmannians*

**Abstract:** Central questions in many branches of mathematics are related to understanding the cohomology class of a graph of a Cremona transformation. One case is statistics, where the Maximum Likelihood degree of Gaussian models can be expressed exactly in this terms. I will report on work in progress with Wisniewski, where we upgrade the relevant Cremona transformation to a C^* action on a blow up of a homogeneous variety. This leads to a new computational approach towards the ML degree.