Doctoral Exam: James Stephens, NC State, Regime Switching Nonlinear Optimal Control
Advisor Medhin, contact for Zoom access.
Events
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Numerical Analysis Seminar: Nathan Kutz, University of Washington, The future of governing equations
SAS 4201A major challenge in the study of dynamical systems is that of model discovery: turning data into reduced order models that are not just predictive, but provide insight into the…
Algebra and Combinatorics Seminar: Radmila Sazdanovic, NC State, Categorification: knots, graphs and more
SAS 2225Categorification is a method that has many emanations hence eludes a precise definition. Therefore, we will discuss categorification through several examples of categorifying polynomials arising from different fields of mathematics, including…
Differential Equations/Nonlinear Analysis Seminar: Guillaume Carlier, CEREMADE, Université Paris-Dauphine, A refined Fenchel-Young inequality and applications to optimal transport and convex duality
ZoomIn this talk, I will first present a very simple quantitative form of the Young-Fenchel inequality. I will then discuss some applications: a short proof of the Brøndsted-Rockafellar in Hilbert…
Graduate Training Seminar: Laura Colmenarejo, NC State, Traveling for research
SAS 4201During this presentation we will discuss the topics like how to find interesting conferences in your field, how to apply for funding, what you should prepare before the conference, what…
Pure Math Graduate Student Seminar: Francisco Ponce Carrion, Marginal Independence Models
SAS 2235Marginal independence models have been commonly studied in the context of graphical models, where we use a graph to convey the different marginal independence relations between random variables. However, there…
Numerical Analysis: Weiqi Chu, UCLA, Non-Markovian opinion models inspired by random walks
SAS 4201For social networks, nodes encode social entities, such as people, twitter accounts, etc., while edges encode relationship or events between entities. Opinion dynamics model opinion evolution as dynamical processes on…
Geometry and Topology Seminar: Kai Xu, Duke, Isoperimetric inequalities on closed surfaces
SAS 4201Let Σ be a closed surface (i.e. a 2-dimensional Riemannian manifold) satisfying the following condition: the first eigenvalue of the elliptic operator -Δ+βK is nonnegative, where K is the Gauss…
Algebra and Combinatorics Seminar: Qing Zhang, Purdue, Classification of Modular Categories by Galois Orbit Count
SAS 2225Given a modular category C, the irreducible characters of its fusion ring are in one-to-one correspondence with the set Irr(C) of isomorphism classes of simple objects of C. Consequently, the…
Differential Equations/Nonlinear Analysis Seminar: Marco Antonio López Cerdá, Universidad de Alicante, A survey of the subdifferential of the supremum function. Featured applications
Zoomhis talk presents various characterizations of the subdifferential of the pointwise supremum of an arbitrary family of convex functions, as well as some featured applications. Starting by the maximum generality…
Teaching and Learning Seminar: Bradley Davis, NC State, Office of Student Conduct Workshop
SAS 4201The learning session will focus on the general operations of the Office of Student Conduct. The presenter will discuss the key procedures associated with academic misconduct cases, including proper adjudication techniques for…
Colloquium: Naihuan Jing, NC State, Quantum Linear Algebra
SAS 1102In linear algebra we know that the Pfaffian of an antisymmetric matrix is a square root of the determinant of matrix. In this talk I will explain how one does…
Symbolic Computation Seminar: Josué Tonelli Cueto, The University of Texas at San Antonio, Computing numerically the homology of semialgebraic sets
SAS 4201Computing the homology of semialgebraic sets is a central problem in computational real algebraic geometry. However, as of today, all symbolic algorithms for this problem require still time that is…
Numerical Analysis Seminar: Shiying Li, UNC-Chapel Hill, Transport transforms for machine learning applications
SAS 4201Data or patterns (e.g., signals and images) emanating from physical sensors often exhibit complicated nonlinear structures in high dimensional spaces, which post challenges in constructing effective models and interpretable machine…
Geometry and Topology Seminar: Vladimir Medvedev, National Research University, Higher School of Economics, Moscow, On the Morse index of the critical Moebius band
ZoomIn this talk I will show that the Morse index of the critical Moebius band in the 4-dimensional Euclidean ball equals 5. This result makes use of the quartic Hopf differential technique and a…
Algebra and Combinatorics Seminar: Sinan Aksoy, Pacific Northwest National Lab
SAS 2225Speaker’s webpage: http://sinanaksoy.com/ Location: Jointly in person and virtually on Zoom. SAS 2225 for in-person participation. The Zoom link is sent out to the Algebra and Combinatorics mailing list, please contact…
Graduate Training Seminar: Seth Sullivant, NC State, Job Interview
SAS 4201This presentation will feature some hands on activities for thinking about getting ready for job interviews, both inside and outside academia.
Pure Math Graduate Student Seminar: Spencer Daugherty, NC State, Quasisymmetric Functions: The Dual Immaculate Basis
SAS 2235Room: SAS 2235 Zoom Meeting link: https://ncsu.zoom.us/j/95923219557?pwd=T3MzUEZRazRaY2tBdjl1dFVJOG50QT09
Numerical Analysis Seminar: Boaz Nadler, Weizmann Institute, Completing Large low rank Matrices with only few observed entries: A one-line algorithm with provable guarantees
SAS 4201Suppose we observe very few entries from a large matrix. Can we predict the missing entries, say assuming the matrix is (approximately) low rank ? We describe a very simple…
Applied Math Graduate Student Seminar: Harley Hanes, NC State, Talk 1 Low-cost Quantification of Fluid Flow Parameter Sensitivity using Reduced-order Modeling, Talk 2 Convergent Uncertainty Quantification in Fluid Dynamics using Reduced-order Models and Machine Learning
SAS 4201Talk 1: Low-cost Quantification of Fluid Flow Parameter Sensitivity using Reduced-order Modeling - Abstract 1: Sensitivity analysis for computational fluid dynamics (CFD) simulations is a complicated procedure, which still relies,…