Combinatorics

Combinatorics and Geometry Seminar

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People

$Sara Billey$

Sara Billey

Professor and John Rainwater Faculty Fellow
$Bennet Goeckner$

Bennet Goeckner

Postdoctoral Scholar
$Me with my bike$

Junaid Hasan

Graduate Student
$Amzi Jeffs$

Amzi Jeffs

Graduate Student
Gaku Liu

Assistant Professor
Kevin Liu

Graduate Student
Eyal Lubetzky

Affiliate Associate Professor; Primary affiliation: Courant Institute of Mathematical Sciences, NYU
$Isabella Novik$

Isabella Novik

Robert R. & Elaine F. Phelps Professor
Jonah Ostroff

Associate Teaching Professor
Patrick Perkins

Associate Teaching Professor
Harry Richman

Postdoctoral Scholar
$Rowan Rowlands$

Rowan Rowlands

Graduate Student
$Farbod Shokrieh, UW$

Farbod Shokrieh

Assistant Professor
$Picture of Jordan$

Jordan Weaver

Graduate Student
David Bruce Wilson

Affiliate Professor
Lei Xue

Graduate Student

News

2014 NSF Postdoctoral Fellows Toby Johnson and Austin Roberts (May 1, 2014)
Thomas Rothvoss arrives with a bang (May 1, 2014)
Matthew Kahle awarded an NSF CAREER grant (April 1, 2014)

Research

Brosowsky, Anna, et al. “Parametrizations of k-Nonnegative Matrices: Cluster Algebras and k-Positivity Tests.” Journal of Combinatorial Theory, Series A, vol. 174, Aug. 2020, p. 105217., doi:10.1016/j.jcta.2020.105217. Learn more
Camacho, C. Counting the Number of Quasiplatonic Topological Actions of the Cyclic Group on Surfaces. Submitted to Rocky Mountain Journal. Learn more

Upcoming Events

A Higher-Dimensional Sandpile Map (Alex McDonough, Brown University) - Jan 27 - 3:30pm to 5:00pm - via Zoom
A categorification of the Malvenuto-Reutenauer algebra via a tower of groups (Farid Aliniaeifard, The University of British Columbia) - Feb 3 - 3:30pm to 5:00pm - via Zoom

Past Events

Empty axis-parallel boxes ( Boris Bukh, Carnegie Mellon University) - January 20, 2021
How to divide multiple cakes fairly using topology ( Shira Zerbib, Iowa State University) - January 13, 2021
Symmetry Adapted Gram Spectrahedra ( Isabelle Shankar, UC Berkeley) - December 9, 2020
The 1/3–2/3 Conjecture for Coxeter groups (Yibo Gao, Massachusetts Institute of Technology) - December 2, 2020
Cubical Pachner moves and bordisms of immersions (Gaku Liu, University of Washington) - November 18, 2020
Order Polynomial Product Formulas and Poset Dynamics (Sam Hopkins, University of Minnesota) - November 4, 2020
The space of monotone paths of a linear program (Jesús A. De Loera, University of California, Davis) - October 28, 2020
Polymatroids and finite groups (Ed Swartz, Cornell University) - October 21, 2020
Cohomology rings of regular nilpotent Hessenberg varieties and hyperplane arrangements (Satoshi Murai, Waseda University) - October 14, 2020
The topological Tverberg problem beyond prime powers (Florian Frick, Carnegie Mellon University) - October 7, 2020
Counting tripods on the torus (Jayadev Athreya, University of Washington) - June 17, 2020
Factorization problems in complex reflection groups (Alejandro Morales, University of Massachusetts, Amherst) - June 3, 2020
Ordered set partitions, Garsia-Procesi modules, and rank varieties (Sean Griffin, University of Washington) - May 27, 2020
Cycle type factorizations in $GL_n F_q$ (Graham Gordon, University of Washington) - May 20, 2020
Separable elements and splittings of Weyl groups (Christian Gaetz, Massachusetts Institute of Technology) - May 13, 2020
Combinatorics of the double-dimer model (Helen Jenne, University of Oregon) - May 6, 2020
Combinatorics of CAT(0) cubical complexes and crossing complexes (Rowan Rowlands, University of Washington) - April 29, 2020
Characterizing quotients of positroids (Anastasia Chavez, University of California, Davis) - April 22, 2020
Coding for sunflowers (Anup Rao, University of Washington) - April 15, 2020
Neural codes and the factor complex (Alexander Ruys de Perez, Texas A&M University) - April 8, 2020
Non-Eulerian Dehn-Sommerville relations (Lei Xue, University of Washington) - March 4, 2020
Measures on graphs and a Kazhdan’s theorem (Farbod Shokrieh, University of Washington) - February 26, 2020
The shape of a random pattern-avoiding permutation (Christopher Hoffman, University of Washington) - February 19, 2020
Embedding dimensions of convex codes (Amzi Jeffs, University of Washington) - February 12, 2020
A topological proof of the Shapiro-Shapiro Conjecture (Jake Levinson, University of Washington) - January 29, 2020
Signed tropical convexity (Georg Loho, London School of Economics and Political Science) - January 15, 2020
A Pieri rule for key polynomials (Danjoseph Quijada) - December 4, 2019
Electrical networks, hyperplane arrangements and matroids (Bob Lutz, Mathematical Sciences Research Institute) - November 20, 2019
Simplicial generation of Chow rings of matroids (Christopher Eur, University of California, Berkeley) - November 13, 2019
Universal oriented matroids for subword complexes of Coxeter groups (Jean-Philippe Labbé, Freie Universität Berlin) - November 6, 2019
Hollow polytopes of large width (Giulia Codenotti, Freie Universität Berlin) - October 30, 2019
Diameter bounds for cocircuit graphs of oriented matroids (Steve Klee, Seattle University) - October 23, 2019
Fixed points of parking functions (Nathan Williams, University of Texas at Dallas) - October 16, 2019
Algebraic signatures of convexity in combinatorial neural codes (Nora Youngs, Colby College) - October 9, 2019
Oriented matroids and combinatorial neural codes (Caitlin Lienkaemper, Pennsylvania State University) - October 2, 2019
Configuration Spaces on Trees with Loops (Safia Chettih) - May 24, 2018
Activated random walk on a cycle (Jacob Richey, University of Washington) - November 27, 2017
'Probabilyzing' Parking Functions (Persi Diaconis, Stanford University) - November 20, 2017
A crystal structure on shifted tableaux, with applications to type B Schubert curves (Maria Gillespie, UC Davis) - March 1, 2017
Confluence and near-confluence (Jim Propp, University of Massachusetts Lowell) - February 22, 2017
On the Existence of Tableaux with Given Modular Major Index (Josh Swanson, University of Washington) - February 8, 2017
Deformation Cones for Polytopes (Federico Castillo, UC Davis) - February 1, 2017
K-Theory and Monodromy of Schubert Curves - January 25, 2017
Greg Warrington, University of Vermont - January 11, 2017

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