Events
Sarah Peluse, Princeton University/IAS, On the polynomial Szemer\’edi theorem and related results
ZoomIn this talk, I'll survey recent progress on problems in additive combinatorics, harmonic analysis, and ergodic theory related to Bergelson and Leibman's polynomial generalization of Szemer\'edi's theorem. Zoom ID: 980 3116 7550 Passcode: last 4 digits of the Zoom ID in reverse order
Differential Equations and Nonlinear Analysis Seminar: Jérôme Bolte, Université Toulouse 1 Capitole, A Bestiary of Counterexamples in Smooth Convex Optimization
ZoomCounterexamples to some old-standing optimization problems in the smooth convex coercive setting are provided. Block-coordinate, steepest descent with exact search or Bregman descent methods do not generally converge. Other failures of various desirable features are established: directional convergence of Cauchy’s gradient curves, convergence of Newton’s flow, finite length of Tikhonov path, convergence of central paths,…
Andrea Klaiber-Langen and Vakhtang Putkaradze from ATCO
ZoomCongratulations, you are graduating with a PhD! You have done fantastic work in your thesis and are ready to take on the world. What is going to happen now? Should you go to industry or academia? You probably heard a lot about both job choices. In this lecture, the speakers, Andrea Klaiber-Langen and Vakhtang Putkaradze,…
Teemu Saksala, NC State, Stable reconstruction of simple Riemannian manifolds from unknown interior sources
ZoomConsider the geometric inverse problem: There is a set of delta-sources in spacetime that emit waves travelling at unit speed. If we know all the arrival times at the boundary cylinder of the spacetime, can we reconstruct the space, a Riemannian manifold with boundary? With a finite set of sources we can only hope to…
Pratik Misra, NC State, Combinatorial problems on trees and graphical models
ZoomChair: Seth Sullivant (smsulli2@ncsu.edu, contact for Zoom access)
Alban Quadrat, Sorbonne University, Paris, France, An introduction to the Quillen-Suslin theorem: algorithms and applications
ZoomIn 1955, Serre conjectured that every row vector with entries in a commutative polynomial ring R=k over a field k, admitting a right inverse over R, could be completed into a square matrix whose determinant is 1. That conjecture was independently proved by Quillen and Suslin in 1976 and is nowadays called the Quillen-Suslin theorem.…
Oliver Dragičević, University of Ljubljana, Slovenia, Trilinear embedding theorem for elliptic partial differential operators in divergence form with complex coefficients
ZoomWe introduce the notion of p-ellipticity of a complex matrix function and discuss basic examples where it plays a major role, as well as the techniques that led to the introduction of the notion. In the second part of the talk we focus on a so-called trilinear embedding theorem for complex elliptic operators and its…
Joris Roos, University of Massachusetts Lowell, Discrete analogues of maximally modulated singular integrals of Stein-Wainger type
ZoomStein and Wainger introduced an interesting class of maximal oscillatory integral operators related to Carleson's theorem. The talk will be about joint work with Ben Krause on discrete analogues of some of these operators. These discrete analogues feature a number of substantial difficulties that are absent in the real-variable setting and involve themes from number theory and analysis. Zoom…
Jonathan Hauenstein, University of Notre Dame, Energy landscapes and algebraic geometry
ZoomBroadly speaking, an energy landscape is the graph of a loss function over a parameter space. Some examples include the potential energy landscape of a chemical reaction, measuring the fitness of a mechanism to perform many tasks, and a loss function arising from a training set in machine learning. This talk will discuss some successes…
Qualifying Exams Presentation and Panel
ZoomIt's time for the last installment in our "Milestones" Series: The Qualifying Exams Presentation and Panel. This event will consist of a short presentation giving an overview of qualifying exams, followed by a panel of four students who cumulatively have taken nearly every qualifying exam. Where: https://ncsu.zoom.us/j/92018165412
Georgy Scholten, NC State, Combinatorial and real algebraic structures in statistics and optimization
ZoomChair: Cynthia Vinzant (clvinzan@ncsu.edu, contact for Zoom access)
Zev Woodstock, NC State, Recovery of functions from nonlinear observations
ZoomChair: Patrick L. Combettes (plc@math.ncsu.edu, contact for Zoom access)
Eric Geiger, NC State, The Signature Quiver and the Global Congruence Problem for Planar Curves
ZoomChair: Irina Kogan (Contact Eric at edgeiger@ncsu.edu for Zoom access)
Meng Zhang, NC State, Blood glucose forecasting: Data-driven model, physiological model, and hybrid approaches
ZoomChair: Hien Tran (tran@ncsu.edu) and Kevin Flores (kbflores@ncsu.edu) - contact for Zoom access
Katherine Harris, NC State, Using Numerical Homotopy Methods in Real Algebraic Geometry
ZoomChair: Agnes Szanto (aszanto@ncsu.edu, contact for Zoom access)
Samantha Kirk, NC State, Toroidal Lie Algebras and Their Vertex Operator Representations
ZoomChair: Bojko Bakalov (bnbakalo@ncsu.edu, contact for Zoom access)
Doctoral Exam: Zack Morrow, NC State, Sparse-Grid Surrogate Models in Computational Chemistry
ZoomChair: Tim Kelley (tim_kelley@ncsu.edu, contact for Zoom access)
Christian Scharrer, University of Bonn, Isoperimetric constrained Willmore tori
ZoomIn order to explain the bi-concave shape of red blood cells, Helfrich proposed to study the minimisation of a bending energy amongst closed surfaces with given fixed area and volume. In the homogeneous case, the Helfrich functional simplifies to the scaling invariant Willmore functional. Thus, for the minimisation, the two constraints on area and volume…
Fall 2021 Math Department Meeting
SAS 4201Zoom link sent via email.