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
$Postojna Cave, Slovenia$

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

Two graduate students awarded NSF postdoctoral fellowships (February 22, 2021)
New Assistant Professors (January 25, 2021)
Amzi Jeffs named NSF Graduate Fellow (April 19, 2018)
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

The equivariant Ehrhart theory of the permutahedron ( Mariel Supina, UC Berkeley) - Apr 21 - 3:30pm to 5:00pm - via Zoom

Past Events

An odd tale of permutation statistics (Angela Carnevale, National University of Ireland, Galway) - April 14, 2021
Type cones and products of simplices (Bennet Goeckner, University of Washington) - April 7, 2021
A structural Szemerédi–Trotter theorem for cartesian products (Adam Sheffer, CUNY) - March 10, 2021
Cubes, Codes, and Graphical Designs (Catherine Babecki, University of Washington) - March 3, 2021
Singular Hodge theory for combinatorial geometries ( Jacob Matherne, University of Oregon) - February 24, 2021
A Proof of Grünbaum's Lower Bound Conjecture for general polytopes, and strongly regular CW spheres (Lei Xue, University of Washington) - February 17, 2021
Decompositions of Ehrhart h*-Polynomials for Rational Polytopes (Andrés R. Vindas Meléndez, University of Kentucky ) - February 10, 2021
A categorification of the Malvenuto-Reutenauer algebra via a tower of groups (Farid Aliniaeifard, The University of British Columbia) - February 3, 2021
A Higher-Dimensional Sandpile Map (Alex McDonough, Brown University) - January 27, 2021
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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