MSCS Seminar Calendar

Monday February 20, 2017
pdf * Geometry, Topology and Dynamics Seminar
Arboreal Galois Representations and Odoni's Conjecture
Nicole Looper (Northwestern University)
3:00 PM in SEO 636
Since the mid-1980s, when the study of arboreal Galois representations first began, most results have concerned the representations induced by quadratic rational maps. In the higher degree case, by contrast, very little has been known. I will discuss some recent results pertaining to higher degree polynomials over number fields. This will include a partial solution to a conjecture made by R.W.K. Odoni in 1985.

pdf * Analysis and Applied Mathematics Seminar
Improved estimates for thermal fluid equations
Andrei Tarfulea (University of Chicago)
4:00 PM in SEO 636
We consider a model for three-dimensional fluid flow on the torus that also keeps track of the local temperature. The momentum equation is the same as for Navier-Stokes, however the kinematic viscosity grows as a function of the local temperature. The temperature is, in turn, fed by the local dissipation of kinetic energy. Intuitively, this leads to a mechanism whereby turbulent regions increase their local viscosity and dissipate faster. We prove a strong a priori bound (that would fall within the Ladyzhenskaya-Prodi-Serrin criterion for ordinary Navier-Stokes) on the thermally weighted enstrophy for classical solutions to the coupled system.
Tuesday February 21, 2017
pdf * Logic Seminar
TBA
Monroe Eskew (VCU)
4:00 PM in SEO 427
Wednesday February 22, 2017
pdf * Algebraic K-Theory Seminar
TBA
Saul Glasman (University of Minnesota)
1:00 PM in SEO 1227

pdf * Graduate Geometry, Topology and Dynamics Seminar
Geodesic Laminations Part 3
Cloie McClellan
3:00 PM in SEO 612
In this talk, I will present the remainder of chapter 3 of Casson and Bleiler. The section covered begins by asking if the automorphism group of a closed hyperbolic surface acts naturally on the surface and then proceeds to present some partial results.

pdf * Statistics Seminar
Functional Coefficient Time Series Models with Trending Regressors
Tingting Cheng (Nankai University)
4:00 PM in SEO 636
We study a functional coefficient time series model with trending regressors, where the coefficients are unknown functions of time and random variables. We propose a local linear estimation method to estimate the unknown coefficient functions. An asymptotic distribution of the proposed local linear estimator is established under mild conditions. A test procedure is developed to test the null hypothesis that the functional coefficients take particular parametric forms. For practical use, we further propose a Bayesian approach to select bandwidths involved in this local linear estimator. Several numerical examples are provided to examine the finite sample performance of the proposed local linear estimator and the test procedure. The results show that the local linear estimator works well and the proposed test has satisfactory size and power. In addition, simulation studies show that the Bayesian bandwidth selection method is better than cross–validation method. Furthermore, we employ the functional coefficient model to study the relationship between consumption per capita and income per capita in U.S. and the results show that functional coefficient model with our proposed local linear estimator and Bayesian bandwidth selection method performs best in both in–sample fitting and out–of–sample forecasting.

pdf * Algebraic Geometry Seminar
Homomorphisms between Cremona groups
Christian Urech (University of Basel / University of Rennes 1)
4:00 PM in SEO 427
The Cremona group is the group of birational transformations of the projective space. While the plane Cremona group is well understood, many questions about Cremona groups in higher dimensions remain open. In this talk we will look at the question how the plane Cremona group can be embedded into Cremona groups in higher dimensions. In particular, I will give a classification of algebraic embeddings from the plane Cremona group to the group of birational transformations of a threefold and explain the geometry of some interesting examples in higher dimensions.
Thursday February 23, 2017
pdf * Graduate Computational Algebraic Geometry Seminar
Parallel Prevarieties: Part 2
Jeff Sommars
3:00 PM in SEO 1227
Friday February 24, 2017
pdf * Departmental Colloquium
Determining forms and data assimilation
Mike Jolly (Indiana University Bloomington)
3:00 PM in SEO 636
A determining form for a dissipative partial differential equation is an ordinary differential equation in a certain trajectory space where the solutions on the global attractor of the PDE are readily recognized. It is an ODE in the true sense of defining a vector field which is (globally) Lipschitz. We discuss two types of determining forms: one where solutions on the global attractor of the PDE are traveling waves, and another where they are steady states. Each determining form is related to a certain approach to data assimilation, i.e. the injection of a coarse-grain time series into the model in order to recover the matching full solution. Applications have been made to the 2D incompressible Navier-Stokes, damped-driven nonlinear Schrodinger, damped-driven Korteveg-de Vries and surface quasigeostrophic equations.
Monday February 27, 2017
pdf * Computer Science Seminar
Complete Derandomization of Identity Testing of Read-Once Formulas
Ilya Volkovich (University of Michigan)
2:00 PM in SEO 612
In this paper we study the identity testing problem of arithmetic read-once formulas (ROF) and some related models. A read-once formula is formula (a circuit whose underlying graph is a tree) in which the operations are {+, ×} and such that every input variable labels at most one leaf. We obtain the first polynomial-time deterministic identity testing algorithm that operates in the black-box setting for read-once formulas, as well as some other related models. As an application, we obtain the first polynomial-time deterministic reconstruction algorithm for such formulas. Our results are obtained by improving and extending the analysis of the algorithm of Shpilka-Volkovich 09’. Joint work with Daniel Minahan.

pdf * Geometry, Topology and Dynamics Seminar
Universal acylindrical actions
Carolyn Abbott (University of Wisconsin, Madison)
3:00 PM in SEO 636
Given a finitely generated group, one can look for an acylindrical action on a hyperbolic space in which all elements that are loxodromic for some acylindrical action of the group are loxodromic for this particular action. Such an action is called a universal acylindrical action and, for acylindrically hyperbolic groups, tends to give a lot of information about the group. I will discuss recent results in the search for universal acylindrical actions, describing a class of groups for which it is always possible to construct such an action as well as an example of a group for which no such action exists.

pdf * Analysis and Applied Mathematics Seminar
A priori upper bounds for the inhomogeneous Landau equation
Stanley Snelson (University of Chicago)
4:00 PM in SEO 636
We consider the Landau equation, an integro-differential kinetic model from plasma physics that describes the evolution of a particle density in phase space. It arises as the limit of the Boltzmann equation when grazing collisions predominate. I will give an overview of prior work on the regularity theory of the Landau equation, and describe how to prove a priori upper bounds that decay polynomially in the velocity variable. The technical tools include precise bounds on the coefficients, and tracking how local estimates scale as the velocity grows. I will also explain why the polynomial decay cannot be improved to exponential decay. This talk is based on joint work with Stephen Cameron and Luis Silvestre.
Tuesday February 28, 2017
pdf * Logic Seminar
A Tale of Two Liouville Closures
Allen Gehret (UIUC)
4:00 PM in SEO 427
$H$-fields are ordered differential fields which serve as an abstract generalization of both Hardy fields (ordered differential fields of germs of real-valued functions at $+\infty$) and transseries (ordered valued differential fields such as $\mathbb{T}$ and $\mathbb{T}_{\log}$). A \emph{Liouville closure} of an $H$-field $K$ is a minimal real-closed $H$-field extension of $K$ that is closed under integration and exponential integration. In 2002, Lou van den Dries and Matthias Aschenbrenner proved that every $H$-field $K$ has exactly one, or exactly two, Liouville closures, up to isomorphism over $K$. Recently (in arxiv.org/abs/1608.00997), I was able to determine the precise dividing line of this dichotomy. It involves a technical property of $H$-fields called $\lambda$-freeness. In this talk, I will review the 2002 result of van den Dries and Aschenbrenner and discuss my recent contribution.
Wednesday March 1, 2017
pdf * Algebraic Geometry Seminar
TBA
Javier Carvajal-Rojas (University of Utah)
4:00 PM in SEO 427
TBA
Monday March 6, 2017
pdf * Combinatorics Seminar
TBA
Tom Bohman (Carnegie Mellon University)
2:00 PM in SEO 612

pdf * Geometry, Topology and Dynamics Seminar
TBA
Malik Obeidin (UIUC)
3:00 PM in SEO 636

pdf * Analysis and Applied Mathematics Seminar
A damped Newton algorithm for semi-discrete optimal transport
Jun Kitagawa (Michigan State University)
4:00 PM in SEO 636
We consider a damped Newton algorithm to calculate the transport map of semi-discrete optimal transport problems, where the initial measure is absolutely continuous while the target measure is discrete. For costs satisfying standard conditions arising in the regularity theory of optimal transport, and initial measures with Hölder continuous density and support satisfying some mild connectivity conditions, we show this algorithm enjoys global linear and local superlinear convergence. A key ingredient in the proof comes from PDE theory, and involves Loeper’s geometric interpretation of the Ma-Trudinger-Wang conditions. This is joint work with Quentin Mérigot and Boris Thibert.
Tuesday March 7, 2017
pdf * Logic Seminar
TBA
James Cummings (Carnegie Mellon University)
4:00 PM in SEO 427
Wednesday March 8, 2017
pdf * Algebraic Geometry Seminar
TBA
Rebecca Tramel (UIUC)
4:00 PM in SEO 427
Friday March 10, 2017
pdf * Departmental Colloquium
TBA
Open House/Recruitment Day (UIC)
3:00 PM in SEO 636
TBA
Monday March 13, 2017
pdf * Combinatorics Seminar
TBA
Yi Zhao (Georgia State)
2:00 PM in SEO 612

pdf * Geometry, Topology and Dynamics Seminar
TBA
Caleb Ashley (University of Michigan)
3:00 PM in SEO 636
TBA

pdf * Analysis and Applied Mathematics Seminar
TBA
Jack Arbunich (UIC)
4:00 PM in SEO 636
TBA
Tuesday March 14, 2017
pdf * Logic Seminar
The relation of embeddability between torsion-free abelian uncountable groups
Filippo Calderoni (Università di Torino)
4:00 PM in SEO 427
We will discuss the problem of determining the Borel complexity of the analytic quasi-order of embeddability between torsion-free abelian groups in both the settings of the classical and generalized Descriptive Set Theory. Then we will see how we can slightly modify a categorical construction by Przezdziecki to prove that, for every uncountable $\kappa$ such that $\kappa^{<\kappa}=\kappa$, the embeddability between $\kappa$-sized torsion-free abelian groups is as complicated as possible among the analytic quasi-orders defined on the generalized Baire space on $\kappa$.
Wednesday March 15, 2017
pdf * Statistics Seminar
TBA
Viswanath Devanarayan (Abbivie)
4:00 PM in SEO 636
TBA
Monday March 27, 2017
pdf * Geometry, Topology and Dynamics Seminar
TBA
Sam Nariman (Northwestern University)
3:00 PM in SEO 636
TBA

pdf * Analysis and Applied Mathematics Seminar
TBA
Zhiwu Lin (Georgia Institute of Technology)
4:00 PM in SEO 636
TBA
Tuesday March 28, 2017
pdf * Logic Seminar
TBA
Gabriel Conant (Notre Dame )
4:00 PM in SEO 427
Wednesday March 29, 2017
pdf * Algebraic K-Theory Seminar
TBA
Marco Varisco (SUNY-Albany)
1:00 PM in SEO 1227

pdf * Algebraic Geometry Seminar
TBA
Samuel Grushevsky (Stonybrook)
4:00 PM in SEO 427
TBA
Friday March 31, 2017
pdf * Departmental Colloquium
TBA
James Freitag (The University of Illinois at Chicago)
3:00 PM in SEO 636
TBA
Monday April 3, 2017
pdf * Geometry, Topology and Dynamics Seminar
TBA
Nick Salter (University of Chicago)
3:00 PM in SEO 636
TBA

pdf * Analysis and Applied Mathematics Seminar
TBA
Trevor Leslie (University of Illinois at Chicago)
4:00 PM in SEO 636
TBA
Wednesday April 5, 2017
pdf * Algebraic Geometry Seminar
TBA
Roya Beheshti (Washington University in St. Louis)
4:00 PM in SEO 427
Friday April 7, 2017
pdf * Departmental Colloquium
TBA
Marta Lewicka (University of Pittsburgh)
3:00 PM in SEO 636
TBA
Monday April 10, 2017
pdf * Geometry, Topology and Dynamics Seminar
TBA
Nathan Clement (Wisconsin )
3:00 PM in SEO 636
TBA

pdf * Analysis and Applied Mathematics Seminar
TBA
Juhi Jang (University of Southern California)
4:00 PM in SEO 636
TBA
Wednesday April 12, 2017
pdf * Algebraic K-Theory Seminar
TBA
Michael Groechenig (Berlin)
1:00 PM in SEO 1227

pdf * Algebraic Geometry Seminar
NO SEMINAR
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4:00 PM in SEO 427
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pdf * Statistics Seminar
TBA
Ju-Yi Yen (University of Cincinnati)
4:00 PM in SEO 636
TBA
TBA
Thursday April 13, 2017
pdf * Algebraic Geometry Seminar
TBA
Rahul Pandharipande (ETH Zurich)
2:00 PM in SEO 427
TBA
Friday April 14, 2017
pdf * Departmental Colloquium
TBA
Jacob Bedrossian (University of Maryland)
3:00 PM in SEO 636
TBA
Monday April 17, 2017
pdf * Combinatorics Seminar
TBD
Boris Bukh (Carnegie Mellon University)
2:00 PM in SEO 612

pdf * Geometry, Topology and Dynamics Seminar
TBA
Emily Cliff (UIUC)
3:00 PM in SEO 636
TBA

pdf * Analysis and Applied Mathematics Seminar
TBA
Cecilia Mondaini (Texas A&M University/ICERM)
4:00 PM in SEO 636
TBA
Wednesday April 19, 2017
pdf * Algebraic K-Theory Seminar
TBA
Mauro Porta (University of Pennsylvania)
1:00 PM in SEO 1227

pdf * Statistics Seminar
TBA
Xi Geng (Carnegie Mellon University)
4:00 PM in SEO 636

pdf * Algebraic Geometry Seminar
TBA
Kenta Sato (University of Tokyo)
4:00 PM in SEO 427
TBA
Friday April 21, 2017
pdf * Departmental Colloquium
TBA
Sándor Kovács (University of Washington)
3:00 PM in SEO 636
TBA
Monday April 24, 2017
pdf * Analysis and Applied Mathematics Seminar
TBA
Zoran Grujic (University of Virginia)
4:00 PM in SEO 636
TBA
Wednesday April 26, 2017
pdf * Departmental Colloquium
TBA
Susan Friedlander (University of Southern California)
3:00 PM in TBA
TBA

pdf * Statistics Seminar
TBA
Prof. Hsin-Hsiung Huang (University of Central Florida)
4:00 PM in SEO 636

pdf * Algebraic Geometry Seminar
TBA
Tommaso de Fernex (University of Utah)
4:00 PM in SEO 427
TBA
Friday April 28, 2017
pdf * Departmental Colloquium
Height Zeta Functions
Yuri Tschinkel (NYU and Simons Foundation )
3:00 PM in TBA
Atkin Memorial Lecture
Monday November 13, 2017
pdf * Geometry, Topology and Dynamics Seminar
TBA
TBA (http://schapos.people.uic.edu/SpectralhiggsIII.html )
3:00 PM in TBA
TBA
HTML 5 CSS FAE
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