# MSCS Seminar Calendar

Monday November 19, 2018
Commutative Algebra Seminar
GKZ-systems and mixed Hodge modules
Uli Walther (Purdue University)
11:00 AM in 427 SEO
I will define GKZ-systems, and talk a little about their properties from the algebraic, analytic, and combinatorial point of view. Then I will discuss a theorem of Gelfand et al, and a sharpening by Mathias Schulze and myself, on the question which GKZ-systems arise as (D-module-)direct image of a natural D-module on a torus. In such cases, the GKZ-system can inherit a mixed Hodge module structure. I will then explain work with Thomas Reichelt that computes the weight filtration of this MHM structure on a class of GKZ-systems that comes up naturally in mirror symmetry. This complements work of Reichelt and Christian Sevenheck who computed the Hodge filtration, and supersedes computations of Batyrev who determined the weight filtration in a generic point. Very few of such explicitly computed structures seem to be known.

Geometry, Topology and Dynamics Seminar
Positivity in the asymptotic regime
Yanir Rubinstein (University of Maryland)
3:00 PM in 636 SEO
A general theme in geometry is the classification of algebraic/differential geometric structures which satisfy a positivity property. In this talk I will propose an asymptotic" version of this theme based on joint work with Cheltsov, Martinez-Garcia, and Zhang. On the algebraic side, we introduce the class of asymptotically log Fano varieties and state a classification theorem in dimension 2, generalizing the classical efforts of the Italian school. The novelty here is the use of tools of convex optimization. On the differential side, I will give a conjectural picture for existence of singular Kahler-Einstein , explain progress towards this conjecture, and, time permitting, relations to singular Kahler-Ricci solitons.

Analysis and Applied Mathematics Seminar
On a dissipative Gross-Pitaevskii-type model for exciton-polariton condensates
Ryan Obermeyer (University of Illinois at Chicago)
4:00 PM in 636 SEO
We study a generalized dissipative Gross-Pitaevskii-type model arising in the description of exciton-polariton condensates. We derive rigorous existence and uniqueness results for this model posed on the one dimensional torus and derive various a-priori bounds on its solution. Then, we analyze in detail the long time behavior of spatially homogenous solutions and their respective steady states. In addition, we will present numerical simulations in the case of more general initial data. We also study the corresponding adiabatic regime which results in a single damped-driven Gross-Pitaveskii equation and compare its dynamics to the one of the full coupled system.
Joint work with C. Sparber, P. Antonelli, P. Markowich, and J. Sierra

Analyzing Growth Rates of an Extremal Function for Hypergraphs
Sayan Mukherjee (UIC)
5:00 PM in 612 SEO
Tuesday November 20, 2018
Spectral gap for groups of algebraic matrices
Wouter van Limbeek (UIC)
3:00 PM in 1227 SEO
Previously we have established a spectral gap for weakly diophantine groups (first part of the work of Benoist-De Saxce). Today we'll cover the second part: We show that groups with algebraic entries are weakly diophantine.

Logic Seminar
An upper bound for uB-sealing
Grigor Sargsyan (Rutgers University)
3:30 PM in 427 SEO
Woodin showed that, assuming the existence of a supercompact cardinal and a class of Woodin cardinals, after collapsing a supercompact cardinal to be countable, the theory of L(Gamma_{uB}) is sealed. Here, Gamma_{uB} is the collection of the universally Baire sets of reals. We say that the theory of L(Gamma_{uB}) is sealed if for any V-generic g and a V[g]-generic h, there is an elementary embedding j: L(Gamma_uB)^{V[g]}-> L(Gamma_uB)^{V[g*h]}. It has been conjectured by the speaker that sealing has a weak large cardinal strength, and its weakness is the reason why the core model induction becomes so much more complicated after passing the threshold given by sealing. In a very recent work, the speaker and Trang showed that sealing is indeed weak, weaker than a Woodin cardinal that is itself a limit of Woodin cardinals. After stating the relevant theorems we will outline why exactly the core model induction becomes rather difficult after this threshold.
Monday November 26, 2018
Special Colloquium
Bernoulli shifts and entropy theory
Brandon Seward (Courant Institute )
3:00 PM in 636 SEO
In ergodic theory, one often studies measure-preserving actions of countable groups on probability spaces. Bernoulli shifts are a class of such actions that are particularly simple to define, but despite several decades of study some elementary questions about them still remain open, such as how they are classified up to isomorphism. Progress in understanding Bernoulli shifts has historically gone hand-in-hand with the development of a tool known as entropy. In this talk, I will review classical concepts and results, which apply in the case where the acting group is amenable, and then I will discuss recent developments that are beginning to illuminate the case of non-amenable groups.
There will be tea in SEO 300 starting at 4:15.

Analysis and Applied Mathematics Seminar
TBA
Ian Tice (Carnegie Mellon University)
4:00 PM in 636 SEO
Wednesday November 28, 2018
Geometry, Topology and Dynamics Seminar
TBA
Fedor Manin (Ohio State University)
3:00 PM in 636 SEO

Algebraic K-Theory Seminar
TBA
Joel Stapleton (UIC)
3:00 PM in 1227 SEO

Special Colloquium
TBA
Fedor Manin (Ohio State University)
3:00 PM in 636 SEO
TBA
There will be tea in SEO 300 starting at 4:15.

Statistics Seminar
TBA
Linyi Zhang (Milliman USA)
4:00 PM in 636 SEO
Friday November 30, 2018
Special Colloquium
TBA
Bena Tshishiku (Harvard)
3:00 PM in 636 SEO
TBA
There will be tea in SEO 300 starting at 4:15.
Monday December 3, 2018
Geometry, Topology and Dynamics Seminar
TBA
Wai Yeung Lam (Brown University)
3:00 PM in 636 SEO
TBA

Mathematical Computer Science Seminar
Algorithms for #BIS-hard problems on expander graphs
Matthew Jenssen (Oxford)
3:00 PM in 427 SEO
We give an FPTAS and an efficient sampling algorithm for the high-fugacity hard-core model on bounded-degree bipartite expander graphs and the low-temperature ferromagnetic Potts model on bounded-degree expander graphs. The results apply, for example, to random (bipartite) d-regular graphs, for which no efficient algorithms were known for these problems (with the exception of the Ising model) in the non-uniqueness regime of the infinite d-regular tree. Joint work with Peter Keevash and Will Perkins.

Analysis and Applied Mathematics Seminar
Interfacial dynamics of dissolving objects in fluid flow
Christopher Rycroft (Harvard University)
4:00 PM in 636 SEO
An advection–diffusion-limited dissolution model of an object being eroded by a two-dimensional potential flow will be presented. By taking advantage of conformal invariance of the model, a numerical method will be introduced that tracks the evolution of the object boundary in terms of a time-dependent Laurent series. Simulations of several dissolving objects will be shown, all of which show collapse to a single point in finite time. The simulations reveal a surprising connection between the position of the collapse point and the initial Laurent coefficients, which was subsequently derived analytically.
Wednesday December 5, 2018
Ultraproducts and Big Polynomial Rings
Matt DeVilbiss (UIC)
2:00 PM in 712 SEO
Wherein I will attempt to introduce ultraproducts in the context of rings and summarize a recent proof of Stillman's conjecture by Erman, Sam, and Snowden.

Algebraic K-Theory Seminar
Stratifications and sheaves on the Ran space
Jānis Lazovskis (UIC)
3:00 PM in 1227 SEO

Mathematical Computing Laboratory
Fall 2018 MCL Research Expo

3:30 PM in 709 SEO

Statistics Seminar
TBA
Viswanath Devanarayan (UIC)
4:00 PM in 636 SEO
Friday December 7, 2018
Departmental Colloquium
TBA
Arend Bayer (Edinburgh)
3:00 PM in 636 SEO
Tuesday January 15, 2019
Logic Seminar
TBA
Sam Corson (University of the Basque Country)
3:30 PM in 427 SEO
Wednesday January 23, 2019
Statistics Seminar
TBA
Wenhui Sheng (Marquette University)
4:00 PM in 636 SEO
Monday January 28, 2019
Geometry, Topology and Dynamics Seminar
TBA
Kevin Schreve (University of Chicago)
3:00 PM in 636 SEO

Analysis and Applied Mathematics Seminar
TBA
Yannis Giannoulis (University of Ioannina, Greece)
4:00 PM in 636 SEO
Monday February 11, 2019
Analysis and Applied Mathematics Seminar
TBA
Shawn Walker (Louisiana State University)
4:00 PM in 636 SEO
Wednesday February 13, 2019
Statistics Seminar
TBA
Chuanshu Ji (University of North Carolina at Chapel Hill)
4:00 PM in 636 SEO
Wednesday February 20, 2019
Statistics Seminar
TBA
Subhashis Ghoshal (North Carolina State University)
4:00 PM in 636 SEO
Friday March 1, 2019
Departmental Colloquium
Part of UIC Distinguished Lecture Series
Peter Sarnak (Princeton)
3:00 PM in 636 SEO
Monday March 4, 2019
Analysis and Applied Mathematics Seminar
TBA
Gideon Simpson (Drexel University)
4:00 PM in 636 SEO
Wednesday March 6, 2019
Statistics Seminar
TBA
Yue Niu (University of Arizona)
4:00 PM in 636 SEO
Friday March 8, 2019
Departmental Colloquium
TBA
Bhargav Narayanan (Rutgers)
3:00 PM in 636 SEO
Monday March 11, 2019
Analysis and Applied Mathematics Seminar
TBA
Paula Vasquez (University of South Carolina)
4:00 PM in 636 SEO
Wednesday March 13, 2019
Statistics Seminar
TBA
Dr. Xiao Zhang (Michigan Technological University)
4:00 PM in 636 SEO
TBA
Friday March 15, 2019
Departmental Colloquium
TBA
Kathryn Mann (Brown University)
3:00 PM in 636 SEO
Monday March 18, 2019
Analysis and Applied Mathematics Seminar
TBA
Ying Wang (University of Oklahoma)
4:00 PM in 636 SEO
Wednesday March 20, 2019
Statistics Seminar
TBA
Mengjia Yu (UIUC)
4:00 PM in 636 SEO
Wednesday March 27, 2019
Statistics Seminar
TBA
Xianyang Zhang (Texas A&M University)
4:00 PM in 636 SEO
Wednesday April 3, 2019
Statistics Seminar
TBA
Marco Ferreira (Virginia Tech)
4:00 PM in 636 SEO
Wednesday April 10, 2019
Statistics Seminar
TBA
William Li (Shanghai Advanced Institute of Finance)
4:00 PM in 636 SEO
Friday April 12, 2019
Departmental Colloquium
TBD
Nikhil Srivastava (UC Berkeley)
3:00 PM in 636 SEO
Wednesday April 17, 2019
Statistics Seminar
TBA
Yehua Li (University of California at Riverside)
4:00 PM in 636 SEO
Monday April 22, 2019
Mathematical Computer Science Seminar
TBA
Andrew Suk (UCSD)
3:00 PM in 427 SEO
Wednesday April 24, 2019
Statistics Seminar
TBA
Leonard Stefanski (North Carolina State University)
4:00 PM in 636 SEO
Wednesday May 8, 2019
Statistics Seminar
TBA
Xiaotong Shen (University of Minnesota)
4:00 PM in 636 SEO
Friday November 1, 2019
Departmental Colloquium
Midwest Dynamical Systems Conference
TBA (TBA)
3:00 PM in 636 SEO
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