The Colloquium is usually held from 3:30 to 4:20 p.m. on Fridays in Exploratory Hall, Room 4106, with refreshments beforehand at 3:00 p.m.

- September 6 ~Hearing the shape of a
locally symmetric space, and arithmetic groups
**Andrei Rapinchuk**, University of Virginia - September 13 ~
**Ken Ono**, University of Virginia - September 20 ~
**Harbir Antil**, George Mason University - October 4 ~
**Carlos Rautenberg**, George Mason University - October 11 ~
**Edwin O'Shea**, James Madison University - October 18 ~
**Thomas Brown**, George Mason University - October 25 ~
**Bonita Saunders**, National Institute of Standards and Technology - November 15 ~
**Jason Rosenhouse**, James Madison University

**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 - March 15 ~ No talk today. (Spring Break!)
- March 29 ~ No talk today (department meeting, 3:30 - 5:00)
- 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 12 ~ No talk today
- 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 - May 3 ~ No talk today

**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**

- 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**

- 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**

- 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**

- 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**

- 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**

- 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**

- 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**

- 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