Events
MGSA Recruitment Weekend Game Night
SAS 1216MGSA is hosting a game night on Friday, February 24 at 8:00pm to welcome the visitors for recruitment weekend. All current graduate students are welcome. This is a great opportunity for the visitors to interact with the grad students. MGSA will provide snacks and drinks.
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SAS 4104José A. Carrillo de la Plata, Imperial College London, “Partial differential equations: a journey from micro to macro”
SAS 4201What links gas molecules, charged particles, bacteria and fish? Partial differential equations help us understanding their collective behaviour. Kinetic modelling allows for a multi-scale strategy in a number of important applications in science and technology. Mean field limits and kinetic descriptions have become one of the most powerful tools in applied mathematics to bridge microscopic and…
Philipp Reiter, Duisburg Essen University, “Repulsive energies”
SAS 4201During the last thirty years, several (families of) functionals have been defined which model self-avoidance: their values tend to infinity if an embedded object degenerates, e.g., if a sequence of closed simple curves converges to a curve with a self-intersection. Many of these functionals exhibit regularizing effects: they not only ensure embeddedness but in fact…
MGSA Pi Day Celebration
SAS 4104In honor of Pi Day, MGSA will provide pie in the 4th floor lounge of SAS on Tuesday, March 14 between 2:00-3:30 pm. Please stop by for a slice of pie, and feel free to bring some pie to share.
Dirk Lorenz, TU Braunschweig, “Randomized sparse Kaczmarz methods”
SAS 4201The Kaczmarz method is a numerical method to solve systems of linear equations and compute minimum-norm solutions of underdetermined systems. Because the method has very low memory requirements it has gained new attention in recent years. In this talk we propose a flexible algorithmic framework that extends the Kaczmarz method such that it also can…
Weekly Brown Bag Lunch
SAS 4104Please join us for our weekly brown bag lunch! You bring your lunch, and we will bring a delicious treat. Everyone (not just women) is welcome to join or stop by for as long as they can!
Emily Meehan, “Posets and Hopf algebras of rectangulations”
SAS 3282Advised by Nathan Reading.
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SAS 4104Daniel Toundykov, University of Nebraska Lincoln, “Stability of degenerately damped vibration”
SAS 4201I will discuss some theoretical and numerical results on the stability properties of a dynamical system modeled by a nonlinear wave equation with a "degenerate" damping. The coefficient of the dissipation term is proportional to the amplitudes, hence its support depends on the geometry of the solution. This feature substantially complicates the stability analysis even…
Tim Kelley, NC State, “Anderson acceleration: convergence theory and numerical experience”
SAS 2229You've probably heard some old guy rant about Newton's method and how it will solve all of your problems: linear, nonlinear, personal, laundry. There's more. In this talk I'll tell you about a way to accelerate plain vanilla fixed point iteration. The first theory for this stuff came from right here in SAS hall and…
Rosa Orellana, Dartmouth College, “The partition algebra, symmetric functions and Kronecker coefficients”
SAS 4201The Schur-Weyl duality between the symmetric group and the general linear group allows us to connect the representation theory of these two groups. A consequence of this duality is the Frobenius formula which connects the irreducible characters of the general linear group and the symmetric group via symmetric functions. The symmetric group is also in…
Tea and Cookies
SAS 4104Junping Wang, NSF, “Primal-dual weak Galerkin finite element methods for PDEs”
SAS 4201This talk will introduce a primal-dual finite element method for variational problems where the trial and test spaces are different. The essential idea behind the primal-dual method is to formulate the original problem as a constrained minimization problem. The corresponding Euler-Lagrange formulation then involves the primal (original) equation and its dual with homogeneous data. The…