The University of Michigan Combinatorics Seminar |
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This is an archive of the talks in the University of Michigan Combinatorics Seminar from January 2000 until April 2011.
From September 2011 onwards, the titles and abstracts of all U-M seminars are maintained in the searchable departmental database.
Combinatorics Seminar organizers in 2000-2015: Sergey Fomin (2000-), Mark Skandera (2000-03), Patricia Hersh (2003-04), Nathan Reading (2004-06), Kyle Petersen (2006-09), Thomas Lam (2009-2015).
date | speaker | affiliation | title (click for an abstract) |
September 24 | Hugh Thomas | U. New Brunswick | Cyclic polytopes and higher dimensional analogues of tropical cluster algebras |
October 1 | Lionel Levine | MIT | Chip-firing and a devil's staircase |
October 8 | Cynthia Vinzant | UC Berkeley | Quartic curves and their bitangents |
October 15 | Jonah Blasiak | U. Michigan | Nonstandard Hecke algebra for the Kronecker problem |
October 22 | Benjamin Young | MSRI | Domino shuffling on a different lattice |
October 29 | Austin Shapiro | U. Michigan | Bounds on the number of lattice points in a polytope via concentration estimates |
November 5 | No seminar | ||
November 12 | Shifra Reif | Weizmann Institute | Denominator identities for Lie superalgebras |
November 19 | Allen Knutson | Cornell University | Puzzles for computing Schubert calculus -- some new results |
November 26 | Thanksgiving | ||
December 3 | June Huh | UIUC | Coloring graphs, counting solutions, and attaching cells |
date | speaker | affiliation | title (click for an abstract) |
January 22 | Ricky Liu | MIT | Matching polytopes and Specht modules |
January 29 | Alexander Barvinok | U. Michigan | Gaussian and almost Gaussian formulas for the number of integer points in polytopes |
February 12 | Elizabeth Beazley | U. Michigan | Maximal Newton polygons associated to affine Weyl group elements |
February 19 | Jonah Blasiak | U. Chicago | Cyclage, catabolism, and the affine Hecke algebra |
February 26 | David Speyer | MIT | Alternating strand diagrams and weakly separated sets |
March 12 | Rinat Kedem | UIUC | Q and T systems, paths and cluster positivity I |
March 19 | Philippe Di Francesco | Saclay | Q and T systems, paths and cluster positivity II |
March 26 | Max Glick | U. Michigan | The pentagram map |
April 2 | Florian Block | U. Michigan | Counting plane curves with Psi-floor diagrams |
April 9 | Alexander Volkov | Steklov Institute | On the periodicity conjecture for Y-systems |
date | speaker | affiliation | title (click for an abstract) |
September 18 | Jeffrey Lagarias | U. Michigan | Ternary expansions of powers of 2 |
September 25 | Frank Sottile | Texas A&M | Orbitopes |
October 2 | Ilia Itenberg | Strasbourg | Tropical Welschinger invariants |
October 9 | Benjamin Howard | U. Michigan | The relations among invariants of points on the projective line |
October 16 | no seminar | Fall break | |
October 23 | Sergey Fomin | U. Michigan | Enumeration of plane curves and labeled floor diagrams |
October 30 | Steven Pon | UC Davis | Affine Stanley symmetric functions |
November 6 | Sami Assaf | MIT | Affine dual equivalence and symmetric functions |
November 13 | Shmuel Friedland | UIC | Matchings, permanents and their random approximations |
November 20 | Alan Stapledon | MSRI | Kneser's theorem and inequalities in Ehrhart theory |
November 27 | no seminar | Thanksgiving | |
December 4 | Karola Meszaros | MIT | Branched polymers and hyperplane arrangements |
December 11 | Harm Derksen | U. Michigan | Valuative invariants for (poly)matroids |
date | speaker | affiliation | title (click for an abstract) |
January 11 | Nantel Bergeron | York | Combinatorial Hopf algebras and towers of algebras |
January 18 | Federico Ardila | SFSU | Tropical hyperplane arrangements and oriented matroids |
January 25 | Patricia Hersh | Indiana | Regular cell complexes modeling Bruhat intervals |
February 8 | Bridget Tenner | DePaul | Pattern avoidance and the Bruhat Order |
March 14 | Anders Jensen | TU Berlin | The "reverse search" property of Gröbner fans |
April 4 | Johannes Rau | TU Kaiserslautern | First steps in tropical intersection theory |
date | speaker | affiliation | title (click for an abstract) |
January 19 | John Stembridge | U. Michigan | Irreducible circuits and Coxeter arrangements |
January 26 | Julianna Tymoczko | U. Michigan | Divided difference operators in the equivariant cohomology of Grassmannians |
February 2 | Petter Brändén | U. Michigan | Some applications of polynomials with the half-plane property |
February 9 | Sara Billey | U. Washington | Embedded factor patterns for Deodhar elements in Kazhdan-Lusztig theory |
February 16 | Martin Strauss | U. Michigan | One sketch for all: Fast algorithms for compressed sensing |
March 9 | Alexander Yong | U. Minnesota | Cominuscule Schubert calculus and tableau combinatorics |
March 23 | David Wilson | Microsoft | Boundary partitions in trees and dimers |
March 30 | Hugh Thomas | U. New Brunswick | (Co)minuscule Schubert Calculus |
April 6 | Ira Gessel | Brandeis U. | Counting permutations by putting balls into boxes |
April 13 | Thomas Lam | Harvard | Temperley-Lieb pfaffinants |
date | speaker | affiliation | title (click for an abstract) |
September 8 | Grigory Mikhalkin | U. Toronto | Curves in P^{n}: inductive enumeration by dimension |
September 15 | Alexander Barvinok | U. Michigan | Counting contingency tables and integer flows |
September 22 | Peter McNamara | Bucknell | When are two skew Schur functions equal? |
September 29 | Nathan Reading | NC State | Sortable elements and Cambrian fans |
October 6 | Pavlo Pylyavskyy | MIT | Poset generating functions and log-supermodularity |
October 20 | David Speyer | Clay/Michigan | Decompositions of matroid polytopes and a new matroid invariant |
October 27 | Kyle Petersen | U. Michigan | The Hopf algebra of posets |
November 3 | Ellen Veomett | U. Michigan | The computational complexity of convex bodies |
November 10 | Maria Chudnovsky | Columbia/Clay | Cycles in dense digraphs |
November 17 | Mihai Ciucu | Georgia Tech | The emergence of the electrostatic field as a Feynman sum in random tilings with holes |
December 1 | Benny Sudakov | Princeton | Pseudo-random graphs: properties and applications |
date | speaker | affiliation | title (click for an abstract) |
February 17 | Satyan Devadoss | Williams College | Configuration spaces, Coxeter operads, and graph-associahedra |
March 10 | Patricia Hersh | Indiana University | The q=-1 phenomenon via homology concentration |
March 24 | Roy Meshulam | Technion | Helly type theorems for Leray complexes |
March 31 | Cristian Lenart | SUNY Albany | Generalizing the combinatorics of Young tableaux to arbitrary Lie type |
April 7 | Harm Derksen | U. Michigan | Quivers and LR-coefficients |
April 14 | Petter Brändén | U. Michigan | The support of polynomials with the half-plane property |
date | speaker | affiliation | title (click for an abstract) |
September 21 (Alg.Geom.) | Harm Derksen | U. Michigan | Quivers and combinatorics |
October 21 | Alexandru Nica | U. Waterloo | A direct bijection for the Harer-Zagier formula |
October 28 | Mike Develin | AIM | Tropical polytopes and their implications |
December 9 | Christophe Hohlweg | Fields Institute | A Loday's realization for the cyclohedron |
date | speaker | affiliation | title (click for an abstract) |
January 7 | Jason Fulman | U. Pittsburgh | Stein's method for combinatorialists |
January 17 (joint w/Alg. Geo.) | Anders Buch | Aarhus U. | A formula for non-equioriented quiver orbits |
January 21 | Nathan Reading | U. Michigan | Clusters, diminishing elements and noncrossing partitions |
January 28 | Alexander Barvinok | U. Michigan | Counting contingency tables and 0-1 matrices |
February 4 | Sergey Fomin | U. Michigan | Generalized cluster complexes and Coxeter combinatorics |
February 18 | Alexander Yong | UC Berkeley | A formula for K-theoretic truncation Schubert calculus |
March 11 | Mark Haiman | UC Berkeley | A combinatorial formula for Macdonald polynomials |
March 18 | David Speyer | UC Berkeley | Combinatorial models for the octahedron and cube recurrences |
April 1 | Satya Lokam | U. Michigan | Quadratic lower bounds on matrix rigidity |
April 8 | Boris Pittel | Ohio State | How frequently are two permutations comparable in Bruhat order? |