# Mathematics Colloquium

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## Mathematics Colloquium

Unless noted otherwise, talks will be on Fridays from 3:30pm - 4:20pm.

In-person: Exploratory Hall, Room 4106.

Virtual: **Zoom**

## Fall 2023

**September 15**

Thurston sets: bagels, teapots, and rings of fire

Kathryn Lindsey, Boston College

**September 22**

Groups of Proper Homotopy Equivalences of Graphs

Hannah Hoganson, University of Maryland

**October 13**

Untangling ad hoc File Formats using the Dowker complex

Michael Robinson, American University

**October 27**

Periodic data rigidity of Anosov diffeomorphisms

Jonathan DeWitt, University of Maryland

**November 10**

Cosmin Pohoata, Emory University

**November 17**

The repulsion property in nonlinear elasticity and a numerical scheme to circumvent it

Pablo Negron, University of Puerto Rico

**December 1**

Randomness, geometry and dynamics

Caglar Uyanik, University of Wisconsin

## Past colloquia

Due to COVID, there were no colloquia for Fall 2020 and Spring 2021.

### Spring 2023

**March 10**

Geometries of topological groups

Christian Rosendal, University of Maryland

**April 7**

Hypergraphs Applied to Commutative Algebra, or, why prove theorems when you can draw pictures?

Courtney Gibbons, Hamilton College

**April 13 - 12:30pm-1:20pm **(Joint with the East Coast Optimization Meeting)

Hierarchical Games under Uncertainty

Uday V. Shanbhag, Penn State

**April 14 - 12:30pm-1:20pm **(Joint with the East Coast Optimization Meeting)

Equilibrium, Energy and Environmental Systems

Michael Ferris, University of Wisconsin Madison

**April 21**

Multilinear and uniform bounds in harmonic analysis

Gennady Uraltsev, University of Virginia

**April 28**

Variational approaches to statistical learning

Ryan Murray, NC State

### Fall 2022

**Friday, September 23**

Entropy along the Mandelbrot set

Giulio Tiozzo, University of Toronto

**Friday, September 30**

The Secret Algebraic Lives of Graphs

Keri Sather-Wagstaff, Clemson University and NSF

**Friday, October 21**

Three Topic Talk: Optimization History, Flat Maps, and Complex Roots

Robert Vanderbei, Princeton University

**Friday, November 11**

Renormalization and Scaling in dynamical systems and analytic number theory

Giovanni Forni, University of Maryland

**Friday, November 18**

Rectifiability and density of measures

Jeremy Tyson, University of Illinois and NSF

### Spring 2022

**February 25**

Isoperimetric Inequalities in Group Theory

Mark Pengitore, University of Virginia

**March 25**

Alternating sign matrix polytopes, theme and variations

Jessica Striker, North Dakota State

**March 31, 12:15 - 1:05PM**

Michael Ulbrich, Technical University Munich

(Joint with the East Coast Optimization Meeting)

**April 1, 12:15 - 1:05PM**

Amir Beck, Tel-Aviv University

(Joint with the East Coast Optimization Meeting)

**April 8**

Adaptive-Robust Stochastic Control with Applications to Financial Markets

Igor Cialenco, Illinois Institute of Technology

**April 15**

Do we need to adapt to a changing climate, or to the rate at which it is changing?

Christopher Jones, UNC Chapel Hill, George Mason University, and the University of Reading

**April 29**

Snakes on the plane: From Alan Turing to modern theories of localised pattern formation

David Lloyd, University of Surrey

### Fall 2021

- November 5 ~ Rigidity of Uniform Roe Algebras
**Bruno Braga**, University of Virginia -**In-person & Zoom** - November 19 ~ Topology and Geometry of Random Cubical Complexes
**Erika Roldan**, TU Munich and EPFL -**Virtual talk**

### Spring 2020

- January 31 ~ Dynamics on character varieties
**Sara Maloni**, University of Virginia

Meeting at an unusual time: 11:30AM! - February 7 ~ Plasmonics on two-dimensional materials: Dispersion and homogenization
**Dionisios Margetis**, University of Maryland - February 14 ~No talk today. (Department meeting, 3:30 - 5:00)
- February 21 ~ Hitchin systems in mathematics and beyond
**Steven Rayan**, University of Saskatchewan - February 28 ~ A D'Ambra Theorem in conformal Lorentzian geometry
**Karin Melnick**, University of Maryland - March 6 ~ Faces of entropy: Connecting Physics, Biology and Quantum Information Science
**Maria Emelianenko**, George Mason University - March 20 ~No talk today (Department meeting, 3:30-5:00)
- March 27 ~ Optimal control of sweeping processes with applications
**Boris Mordukhovich**, Wayne State University**Postponed until Fall 2020** - April 2 ~ A Method for Vertical Federated Learning
**Postponed - date to be announced****Wotao Yin**, University of California, Los Angeles - April 3 ~ Nonconvex Optimization: Opportunities and Challenges
**Frank E. Curtis**, Lehigh University**Postponed - date to be announced** - April 17 ~
**Mahamadi Warma**, George Mason University**Postponed until Fall 2020** - April 24 ~No talk today (Department meeting, 3:30-5:00)

### Fall 2019

#### Fall, 2019

- September 6 ~Hearing the shape of a locally symmetric space, and arithmetic groups
**Andrei Rapinchuk**, University of Virginia - September 13 ~Jensen-Polya Program for the Riemann Hypothesis and Related Problems
**Ken Ono**, University of Virginia - September 20 ~ PDE Constrained Optimization with Applications
**Harbir Antil**, George Mason University - October 4 ~ Quasi-variational inequalities in function spaces: Applications, theory and solution algorithms
**Carlos Rautenberg**, George Mason University - October 25 ~ B-Splines and 3D Web Graphics: Mathematics and Technology Behind the Visualizations of the NIST Digital Library of Mathematical Functions
**Bonita Saunders**, National Institute of Standards and Technology - November 1 ~ The Parallel Postulate and Geometries without Rigidity
**Edwin O'Shea**, James Madison University - November 8 ~ An overview of PDE constrained optimization with applications
**Thomas Brown**, George Mason University - November 15 ~ Decomposition Theorems for Cayley Graphs of Matrix Groups
**Jason Rosenhouse**, James Madison University

### Spring 2019

#### Spring, 2019

- January 25 ~ Stanley-Reisner rings of symmetric simplical complexes
**Emanuele Delucchi**, University of Fribourg - March 1 ~ Finding Ellipses: What the numerical range, Poncelet's

theorem, and Blaschke products have to do with it**Pamela Gorkin**, Bucknell University and NSF - April 4 ~ Computational complexity of stochastic programs
**Alexander Shapiro,**Georgia Institute of Technology

10:50-11:50AM, Room E/F Johnson Center

(Joint with the East Coast Optimization Meeting ) - April 5 ~ On the Rigorous Evaluation of Stochastic Approaches to Power Systems Operations
**Jean-Paul Watson,**Sandia National Laboratories

10:50-11:50AM, Room E/F Johnson Center

(Joint with the East Coast Optimization Meeting) - April 19 ~ From Grassmannians to Automated Geometric Proofs
**Will Traves,**U.S. Naval Academy - April 26 ~ Variations on a theme by George B. Dantzig: Revisiting the principles of the simplex method
**Jesús De Loera,**University of California, Davis

### Fall 2018

#### Fall, 2018

- October 19 ~ Lower bounds for the covolume of lattices of semi-simple Lie groups
**Ilesanmi Adeboye**, Wesleyan University - October 26 ~ Grassmannians and Pseudosphere Arrangements
**Michael Dobbins**, Binghamton University - November 9 ~ Stability for symmetric groups and Hecke algebras
**Weiqiang Wang**, University of Virginia - November 16 ~ A decomposition of tensor space and Schur-Weyl duality
**Matt Douglass**, National Science Foundation

### Spring 2018

#### Spring, 2018

- February 9 ~ Introduction to cluster algebras
**Kyungyong Lee**, University of Nebraska - February 13 ~ Algebraic geometry in characteristic one
**Jaiung Jun**, Binghamton University - February 14 ~ Test Ideals of Commutative Rings of All Characteristics
**Rebecca Rebhuhn-Glanz**, Syracuse University - February 15 ~ Noncommutative algebra from a geometric point of view
**Xingting Wang**, Temple University - February 23 ~ Combinatorics and the Quadratic Formula
**Lou Shapiro**, Howard University - March 9 ~ Degree Sequences with Forced Edges
**Brian Cloteaux**, NIST - March 23 ~ Avoiding Patterns and Making the Best Choice
**Brant Jones**, James Madison University - March 30 ~ Scalable optimization algorithms for large-scale subspace clustering
**Daniel Robinson**, Johns Hopkiins University - April 6 ~ Combinatorics, computing, and k-Schur functions
**Jennifer Morse**, University of Virginia - April 13 ~ Generalized Graphic Matroids in Projective Geometry
**Thomas Zaslavsky**, Binghamton University - April 27 ~ The Yang-Mills Flow and Moduli Spaces
**Richard Wentworth**, University of Maryland

### Fall 2017

#### Fall, 2017

- October 6 ~A superquadratic variant of Newton's method
**Florian Potra**, UMBC - October 20 ~ The Bochner--Hartogs dichotomy
**Terry Napier**, Lehigh - October 27 ~ Product formulas for volumes of flow polytopes
**Karola Mészáros**, Cornell - November 3 ~ On the concentration of eigenfunctions
**Chris Sogge**, Johns Hopkins - November 10 ~ Apple vs. Samsung: a Mathematical Battle
**Jim Davis**, University of Richmond - December 8 ~ Detecting properties from descriptions of groups.
**Jennifer Chubb**, University of San Francisco

### Spring 2017

#### Spring, 2017

- February 13 ~ The Heisenberg group: geometry, analysis, and number theory
**Anton Lukyanenko**, University of Michigan - February 14 ~ Rees-like Algebras and the Eisenbud-Goto Conjecture
**Jason McCullough**, Rider University - February 16 ~ Bayesian Filtering for Time-Varying Parameter Estimation in Biological Models
**Andrea Arnold**, North Carolina State University - February 17 ~ Multiscale inverse problems for partial differential equations and applications to sonar imaging
**Christina Frederick**, Georgia Institute of Technology - February 20 ~ Hidden symmetries in geometry, arithmetic, and physics >
**Brent Doran**, ETH - February 24 ~ Learning manifolds from data
**Tyrus Berry**, George Mason University - March 24 ~ Kernel methods for Koopman mode analysis and prediction: Ergodic and skew-product systems
**Dimitris Giannakis**, Courant Institute of Mathematical Sciences - April 21 ~ Basin entropy: a new tool to explore uncertainty in dynamical systems
**Miguel Sanjuan**, Universidad Rey Juan Carlos

Today's colloquium is presented jointly with the Department of Physics and Astronomy - May 5 ~ Inductive tools for graphs (and matroids)
**Carolyn Chun**, United States Naval Academy

### Fall 2016

#### Fall, 2016

- September 9 ~ Symmetries of Knots
**Swatee Naik**, University of Nevada, Reno - September 23 ~ Playing with homotopy: does Khovanov homology lead to bouquets of spheres?
**Jozef Przytycki**, George Washington University - September 30 ~ How to make 3-D printed sculptures of 4-D things
**Henry Segerman**, Oklahoma State University - October 7 ~ To Replace or Not to Replace in Finite Population Sampling
**Daniel Q. Naiman**, Johns Hopkins University - October 14 ~ Uniform Algebras
**Carl Weisman** - October 28 ~ The Kazhdan-Lusztig polynomial of a matroid
**Max Wakefield**, United States Naval Academy - November 11 ~ Heads and Tails in a Klein-Gordon equation
**Svetlana Roudenko**, George Washington University

### Spring 2016

#### Spring, 2016

- February 12 ~ Lie algebras and the rational homotopy groups of a topological space
**Steve Halperin**, University of Maryland, College Park - February 26 ~ Erdos-Szekeres type theorems for planar convex sets
**T. Bisztriczky**, University of Calgary - March 4 ~ Phase Retrieval using Structured Measurements
**Yi Kai Liu**, National Institute of Standards and Technology - March 25 ~ Phased matroids and matroids over hyperfields
**Laura Anderson**, Binghamton University - April 8 ~ Weighted composition operators on the space of analytic functions with derivative in the Hardy-Hilbert space
**Robert Allen**, University of Wisconsin, La Crosse - April 22 ~ Projection: A Unified Approach to Semi-Infinite Linear Optimization and Duality in Convex Programming
**Amitabh Basu**, Johns Hopkins University - April 29 ~ Mathematical Perseverance, or, Try to Hear What the Mathematics Is Trying to Tell You
**George Andrews**, Pennsylvania State University

### Fall 2015

#### Fall, 2015

- August 28 ~How to sample a stochastic operator?
**Götz Pfander,**, Jacobs University Bremen - September 4 ~ Line tension of Lamuir-Blodgett films: theory and experiment
**Jay Alexander**, University of Maryland, College Park - September 11 ~ A flexible regression model for count data
**Kimberly Sellers**, Georgetown University - September 25 ~ The Atlas of Lie Groups and Representations
**Jeffrey Adams**, University of Maryland, College Park - October 2 ~ A survey of alternating permutations
**Richard Stanley**, Massachusetts Institute of Technology - October 9 ~ Shearer's Method in Ramsey Theory
**Jacques Verstraëte**, National Science Foundation - October 16 ~ Mean Minkowski Measures for Convex Sets and Grünbaum's Conjecture for Affine Diameters
**Gabor Toth**, Rutgers University, Camden - October 30 ~ Automated Conjecture-Making
**Craig Larson**, Virginia Commonwealth University - November 20 ~ Distance functions on computable graphs
**Jennifer Chubb**, University of San Francisco

### Spring 2015

#### Spring, 2015

- January 23 ~ Probabilistic Analysis of QuickSort: An Overview
**Jim Fill**, Johns Hopkins University - February 6 ~ Integral point in orbits of morphisms on curves
**Vijay Sookdeo**, Catholic University of America - February 13 ~ Elliptic sequences and Pfaffian Triples
**Michael Somos**, Georgetown University - February 20 ~ From Broken Circuits to Monte Carlo: Approximating the Coefficients of the Chromatic Polynomial
**Yvonne Kemper**, National Institute of Standards and Technology - March 6 ~ A new nonmonotone spectral projected gradient method for semidefinite programming problem with log-determinant and l_1 norm objective function
**Mituhiro Fukuda**, Tokyo Institute of Technology - March 20 ~ Approximating the permanent
**Francis Sullivan**, IDA/Center for Computing Sciences - April 3 ~ Planar graphs are 9/2-colorable and have big independent sets
**Dan Cranston**, Virginia Commonwealth University - April 17 ~ Cellular automorphisms of embedded graphs and two mathematical applications
**Lowell Abrams**, George Washington University - April 24 ~ Multiple junctions in polycrystals
**David Caraballo**, Georgetown University

### Fall 2014

#### Fall, 2014

- August 29 ~ Combinatorial Reciprocity Theorems
**Matthias Beck**, San Francisco State University - September 5 ~ The discrete Morse theory of Cech and Delaunay complexes
**Herbert Edelsbrunner**, Institute of Science and Technology Austria - September 19 ~ Three-dimensional affine crystals
**Bill Goldman**, University of Maryland - September 26 ~ Novel Stochastic Methods in Biochemical Electrostatics
**Michael Mascagni**, Florida State University (currently, NIST) - October 3 ~
**Faculty Symposium**organized by our SIAM Student Chapter - October 17 ~
**Jack Edmonds**, University of Waterloo - October 24 ~ Enumeration in polytopes and Coxeter groups
**Lou Billera**, Cornell University - November 7 ~ Patterns in permutations
**Alex Burstein**, Howard University - December 5 ~ Decision Problems and Representations
**Ben McReynolds**, Purdue University