MenuEvents for 09/11/2019 from all calendars
Student Working Seminar in Groups and Dynamics
Time: 1:00PM - 2:00PM
Location: BLOC 628
Speaker: Krzysztof Święcicki
Title: A Brief Introduction to 3 Dimensional Manifolds
Abstract: In his celebrated work from 2003, Perelman finished the proof of Poincare conjecture in dimension 3. His result is in fact far stronger and implies Thurston's geometrization conjecture, which classifies possible geometric structures on 3 manifolds. I'll give an overview of the result and introduce all eight basic geometries and their connection to group theory. I won't assume any knowledge outside of basic topology, so any newcomers are welcome.
Numerical Analysis Seminar
Time: 3:00PM - 4:00PM
Location: BLOC 628
Speaker: Winnifried Wollner, TU Darmstadt
Title: Optimization of Phase-Field Damage Evolution
Abstract: Within this talk, we will address optimization problems governed by time-discrete phase-field damage processes. The presence of an irreversibility of the fracture growth gives rise to a nonsmooth system of equations. To derive optimality conditions we introduce an additional regularization and show that the resulting optimization problem is well-posed. To tackle discretization errors, as well as convergence in the limit of the irreversibility penalty, an improved differentiability result is shown for the time discrete regularized damage process. Based upon this, we can show that certain local minimizers of the optimization problem can be approximated by the proposed penalty approach. Further, we will give a short discussion of resulting discretization error estimates.
Groups and Dynamics Seminar
Time: 3:00PM - 4:00PM
Location: BLOC 220
Speaker: Nguyen-Bac Dang, Stonybrook
Title: Spectral gap in the dynamical degrees of tame automorphism preserving an affine quadric threefold
Abstract: In this talk, I will present the tame automorphisms group preserving an affine quadric threefold. The main focus of my talk is the understanding of the degree sequences induced by the elements of this group. Precisely, I will explain how one can apply some ideas from geometric group theory in combination with valuative techniques to show that the values of the dynamical degrees of these tame automorphisms admit a spectral gap. Finally I will apply these techniques to study random walks on this particular group.
Committee P&T Meeting
Time: 4:00PM - 4:30PM
Location: BLOC 220
Speaker: Committee P&T Meeting, Texas A&M University
Graduate Student Organization Seminar
Time: 4:00PM - 5:00PM
Location: BLOC 628
Speaker: Konrad Wrobel
Title: Random Rooted Graphs
Abstract: Random rooted graphs are connected to many different areas of mathematics, including percolation theory, sofic groups, locally compact groups, and ergodic theory. They arise naturally when one attempts to define a notion of convergence for sequences of finite graphs. We'll introduce Benjamini-Schramm convergence and discuss some open problems and applications related to it. We'll then switch gears and discuss the Mass Transport Principal and unimodular graphs. If time permits, I will mention some applications to percolation theory.
Committee P Meeting
Time: 4:30PM - 5:00PM
Location: BLOC 220
Speaker: Committee P Meeting, Texas A&M University
First Year Graduate Student Seminar
Time: 5:30PM - 6:30PM
Location: Blocker 628
Title: Outreach Opportunities
AMUSE
Time: 6:00PM - 7:00PM
Location: Blocker 2F
Title: Math Undergraduate Research Expo
Abstract: A number of math students will present posters describing their research and results, and will be on hand to talk about their experience. As usual, pizza and drinks will be available.
URL: Event link
