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# Combinatorics and Geometry Seminar

UW Combinatorics and Geometry Seminar meets in Padelford C-401 on Wednesdays, 4:10pm-5:10pm, and is preceded by the pre-seminar, 3:30pm-4:00pm.

Further details can be found at https://sites.math.washington.edu/~combinat/

## Upcoming Events

**Isabella Novik, University of Washington**

May 19, 2021 - 3:30pm to 5:00pm

via Zoom

**Amzi Jeffs, University of Washington**

May 26, 2021 - 3:30pm to 4:30pm

via Zoom

## Past Events

- On Schubert polynomials (Karola Mészáros, Cornell University) - May 12, 2021
- Complex analysis meets combinatorics (Steffen Rohde, University of Washington) - May 5, 2021
- An Efficient Algorithm for Deciding the Vanishing of Schubert Polynomial Coefficients (Colleen Robichaux, UIUC) - April 28, 2021
- The equivariant Ehrhart theory of the permutahedron ( Mariel Supina, UC Berkeley) - April 21, 2021
- 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
- The upper bound theorem for centrally symmetric simplicial spheres (Hailun Zheng, University of Michigan) - July 29, 2019
- Hessenberg varieties and the Stanley--Stembridge conjecture (Martha Precup, Washington University in St. Louis) - June 5, 2019
- Matroids and statistical dependency (Art Duval, University of Texas at El Paso) - June 5, 2019
- Exposed circuits, linear quotients, and chordal clutters (Anton Dochtermann, Texas State) - May 29, 2019
- Affine Schubert calculus and diagonal coinvariants (Erik Carlsson, UC Davis) - May 22, 2019
- Counting flags in Eulerian posets: The cd-index (Marge Bayer, University of Kansas) - May 15, 2019
- K polynomials and matroids (Andrew Berget, Western Washington University) - May 8, 2019
- Cyclic sieving, necklaces, and branching rules related to Thrall's problem (Connor Ahlbach, UW) - April 17, 2019
- Algebraic characterizations and combinatorial properties of (non)regular graphs with thin module of endpoint zero (Safet Penjić, University of Primorska, Andrej Marušič Institute) - April 10, 2019
- Unfolding Mathematics at Burning Man (Satyan Devadoss, University of San Diego) - March 4, 2019
- Involution graph Schubert varieties (Brendan Pawlowski, University of Southern California) - February 27, 2019
- TBA (Julianna Tymoczko, Smith College) - February 20, 2019
- 2-associahedra (Nathaniel Bottman, Institute for Advanced Study) - February 13, 2019
- Local constructions of manifolds (Bruno Benedetti, University of Miami) - February 6, 2019
- Characterization of Queer Supercrystals. (Graham Hawkes, UC Davis) - January 30, 2019
- Closed Singular Geodesics on Platonic Solids (Jayadev Athreya, UW) - January 16, 2019
- Enumerating spanning trees in bipartite graphs (Steve Klee, Seattle University) - December 5, 2018
- Minimal Obstructions to Convexity in Combinatorial Codes (Amzi Jeffs, University of Washington) - November 28, 2018
- Completely log concave polynomials and Mason’s log concavity conjecture (Shayan Oveis Gharan, University of Washington) - November 14, 2018
- The slack realization space of a polytope (Amy Wiebe) - November 7, 2018
- A Simply Exponential Upper Bound on the Maximum Number of Stable Matchings (Anna Karlin, University of Washington) - October 31, 2018
- Graded Expectations: An Invitation to Probabilistic Commutative Algebra (Matthew Stamps, Yale-NUS College) - October 24, 2018
- Decomposing k-fold acyclic complexes (Bennet Goeckner, University of Washington) - October 17, 2018
- The Unit-distance graph and the Odd-distance graph (Moshe Rosenfeld, University of Washington, Tacoma) - October 10, 2018
- Chromatic quasisymmetric functions and regular semisimple Hessenberg varieties (John Shareshian, Washington University in St. Louis) - October 3, 2018
- Sandpiles, (un)decidability, and mod 1 harmonic functions (Lionel Levine, Cornell University) - August 28, 2018
- Splitting Loops and Necklaces: Variants of the Square Peg Problem (Florian Frick, Cornell University) - July 9, 2018
- Refinement of partition identities (Jehanne Dousse, Universität Zürich) - June 18, 2018
- The Combinatorics of Macdonald Polynomial Operators (Jim Haglund, University of Pennsylvania) - May 30, 2018
- Major Index Statistics: Cyclic Sieving, Branching Rules, and Asymptotics (Josh Swanson, University of Washington) - May 23, 2018
- The conjugacy action of S_n and variations on the module Lie_n (Sheila Sundaram, Pierrepont School) - May 16, 2018
- Matroid h-vectors (José Samper, University of Miami) - May 9, 2018
- Symmetric functions, towers of algebras, and Heisenberg categories (Henry Kvinge, University of California, Davis) - May 2, 2018
- Forbidden Configurations in Discrete Geometry (David Epstein, University of California, Irvine) - April 25, 2018
- Staircase diagrams and the enumeration of smooth affine permutations (Ed Richmond, Oklahoma State University) - April 18, 2018
- CLT for descents in conjugacy classes of S_n (Gene Kim, University of Southern California) - April 11, 2018
- Singularities of K-orbit closures and interval pattern avoidance (Ben Wyser, Oklahoma State University) - April 4, 2018
- (Pre-seminar) Subvarieties of the flag variety, smoothness, and patterns (Ben Wyser, Oklahoma State University) - April 4, 2018
- Taking the long way home: Orbits of plane partitions (Oliver Pechenik, University of Michigan) - March 28, 2018
- Statistics and Computing by Counting Inversions (Marina Meila, University of Washington) - March 7, 2018
- (AAG Seminar) Cohomology of cluster varieties (David Speyer, University of Michigan) - March 6, 2018
- Ideals of QSym, shuffle-compatibility and exterior peaks (Darij Grinberg, University of Minnesota) - February 28, 2018
- Shuffle-Compatible Permutation Statistics (Yan Zhuang, Brandeis University) - February 21, 2018
- On the Circuit Diameter Conjecture (Tamon Stephen, Simon Fraser University) - February 14, 2018
- Rational smoothness and pattern avoidance for arbitrary involutions (Monty McGovern, University of Washington) - February 7, 2018
- Reflection length in affine reflection groups (Joel Lewis, George Washington University) - January 31, 2018
- Projectively consistent random walks on a space of trees with integer edge weights (Noah Forman, University of Washington) - January 24, 2018
- Dual braid monoids, Koszul algebras, and clusters (Philippe Nadeau, CNRS & Université Lyon 1) - January 17, 2018
- Prism Tableaux and Alternating Sign Matrices (Anna Weigandt, University of Illinois at Urbana-Champaign) - January 11, 2018
- Prism Tableaux and Alternating Sign Matrices (Pre-Seminar) (Anna Weigandt, University of Illinois at Urbana-Champaign) - January 10, 2018
- Noncommutative Schur functions, Fomin-Greene monoids and LR coefficients (Vasu Tewari, University of Washington) - December 6, 2017
- The combinatorics of symmetric quotient rings (Andy Wilson, University of Pennsylvania) - November 29, 2017
- 'Probabilyzing' Parking Functions (Persi Diaconis, Stanford University) - November 20, 2017
- Gram’s relation, cone valuations, and combinatorics (Raman Sanyal, Goethe-University Frankfurt) - November 15, 2017
- Tight and stacked triangulations of manifolds (Basudeb Datta, Indian Institute of Science) - November 8, 2017
- Descent polynomials (Bruce Sagan, Michigan State University) - November 2, 2017
- Generalized Permutohedra from Probabilistic Graphical Models (Josephine Yu, Georgia Institute of Technology) - October 25, 2017
- The geometry of scheduling (Carly Klivans, Brown University) - October 18, 2017
- The Peterson Isomorphism: Moduli of Curves and Alcove Walks (Elizabeth Milicevic, Haverford College) - October 11, 2017
- A crystal-like structure on shifted tableaux (Jake Levinson, University of Washington) - October 4, 2017
- Affine Robinson-Schensted and affine dual equivalence graphs ( Pavlo Pylyavskyy, University of Minnesota-Twin Cities) - September 27, 2017
- Matroid Kazhdan-Lusztig polynomials (Max Wakefield, USNA) - August 3, 2017
- Cyclic descents of standard Young tableaux (Yuval Roichman, Bar-Ilan University) - July 6, 2017
- A characterization of simplicial manifolds with g2 ≤ 2 (Hailun Zheng, University of Washington) - July 3, 2017
- On a hierarchy of Hopf monoids related to matroid theory (José Alejandro Samper, University of Miami) - May 31, 2017
- An Introduction to Species and Operads (Jonathan Beardsley, University of Washington) - May 24, 2017
- Schur positivity and ascent-descent statistics on labeled binary trees (Sean Griffin, University of Washington) - May 17, 2017
- Thieves and high-dimensional necklaces (Pablo Soberón, Northeastern University) - May 10, 2017
- Chromatic bases for symmetric functions (Samantha Dahlberg, University of British Columbia) - May 3, 2017
- Rhombic tilings and Bott-Samelson varieties (Escobar Vega, Laura, UIUC) - April 26, 2017
- A Gröbner basis for the graph of the reciprocal plane (Alex Fink, Queen Mary University of London) - April 19, 2017
- Intersecting Families of Permutations (Michelle Delcourt, University of Illinois at Urbana-Champaign) - March 8, 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
- Chromatic numbers of stable Kneser hypergraphs - January 18, 2017
- Greg Warrington, University of Vermont - January 11, 2017