Events for 11/14/2019 from all calendars

Several Complex Variables Seminar

Time: 2:00PM - 3:00PM

Location: BLOC 220

Speaker: Debraj Chakrabarti, Central Michigan University

Title: An Alexander-Pontrjagin type duality in the L² theory of the ∂-operator

Abstract: Hörmander's L² estimates on the ∂-equation on bounded pseudoconvex domains are a cornerstone of modern complex analysis. From the very beginning, attempts have been made (by Folland-Kohn, Shaw, Hörmander and others) to extend these L² methods to appropriate classes of nonpseudoconvex domains. In this talk, we discuss an approach to the ∂-problem on an annulus between two weakly pseudoconvex domains which is inspired by Alexander-Pontrjagin duality in topology. This is ongoing joint work with Phil Harrington of Arkansas.

Student/Postdoc Working Geometry Seminar

Time: 3:00PM - 4:00PM

Location: BLOC 628

Speaker: CJ Bott, TAMU

Title: Mukai 11-14

Geometry Seminar

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.