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SAS 4201

Upcoming Events

February 2018

Seth Sullivant, NC State, Algebraic Statistical Models in Phylogenetics

February 26 | 11:00 am - 12:00 pm EDT

Phylogenetics is the branch of mathematical biology concerned with constructing evolutionary relationships between collections of species.  These lectures will introduce these models, in particular emphasizing the ways that algebraic statistics can be used to analyze properties of the models.  Viewed…

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Nathan Reading, NC State, To scatter or to cluster?

February 26 | 3:00 pm - 4:00 pm EDT

Scattering diagrams arose in the algebraic-geometric theory of mirror symmetry. Recently, Gross, Hacking, Keel, and Kontsevich applied scattering diagrams to prove many longstanding conjectures about cluster algebras. Scattering diagrams are certain collections of codimension-1 cones, each weighted with a formal power series. In this…

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John Lowengrub, University of California, Irvine, BioDDFT: A hybrid continuum-discrete mechanical collective cell model

February 26 | 4:00 pm - 5:00 pm EDT

The regulation of cell division, cell sizes and cell arrangements is central to tissue morphogenesis. To study these processes, we develop a mechanistic hybrid continuum-discrete mathematical model of cell dynamics that has advantages over previous approaches. This model borrows ideas…

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Wilkins Aquino, Duke University, A Locally Adapted Reduced Basis Method for Solving Risk-Averse PDE-Constrained Optimization Problems

February 27 | 3:00 pm - 4:00 pm EDT

The numerical solution of large-scale risk-averse PDE-constrained optimization problems requires substantial computational effort due to the discretization in physical and stochastic dimensions. Managing the cost is essential to tackle such problems with high dimensional uncertainties. In this work, we combine an inexact trust-region…

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Jennifer Hom, Georgia Tech, Heegaard Floer and homology cobordism

February 28 | 10:40 am - 11:30 am EDT

We study applications of Heegaard Floer homology to homology cobordism. In particular, to a homology sphere Y, we associate a module HF_conn(Y), called the connected Heegaard Floer homology of Y, and show that this module is invariant under homology cobordism…

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Elmas Irmak, University of Michigan, Simplicial Maps of Complexes of Curves and Mapping Class Groups of Surfaces

February 28 | 1:00 pm - 2:00 pm EDT

I will talk about recent developments on simplicial maps of complexes of curves on both orientable and nonorientable surfaces. I will also talk about joint work with Prof. Luis Paris. We prove that on a compact, connected, nonorientable surface of genus…

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Lilian Gladden, Paris 6, Equilibria via dynamics involving nonautonomous difference equations with affine weights

February 28 | 3:00 pm - 4:00 pm EDT
March 2018

Gabor Pataki, UNC-Chapel Hill, Bad semidefinite programs, linear algebra, and short proofs

March 13 | 3:00 pm - 4:00 pm EDT

Semidefinite programs (SDPs) -- optimization problems with linear constraints, linear objective, and semidefinite matrix variables --  are some of the most useful, versatile, and pervasive optimization problems to emerge in the last 30 years. They find applications in combinatorial optimization, machine learning, and statistics, to…

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Weiwei Hu, Oklahoma State University, An Approximating Control Design for Optimal Mixing by Stokes Flows

We consider an approximating control design for optimal mixing of a non-dissipative scalar eld in unsteady Stokes ows. The objective of our approach is to achieve optimal mixing at a given nal time, via an active control of the ow velocity through…

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Patricia Hersh, T. Khai Nguyen, NC State

March 16 | 3:00 pm - 4:00 pm EDT

Constantine Dafermos, Brown University

April 2018

Tom Witelski

Sergi Elizalde, Dartmouth College

April 16 | 3:00 pm - 4:00 pm EDT

John Harlim, Penn State University

Daphne Klotsa, University of North Carolina at Chapel Hill, A touch of non-linearity at intermediate Reynolds numbers: where spheres “think” collectively and swim together

From crawling cells to orca whales, swimming in nature occurs at different scales. The study of swimming across length scales can shed light onto the biological functions of natural swimmers or inspire the design of artificial swimmers with applications ranging from…

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