Combinatorics seminar 2019-2020

Spring 2020

Unless otherwise noted, the seminar will meet on Wednesday afternoon, 4–5 in Rome 204. All remaining seminar dates this semester are cancelled due to coronavirus.

Date	Speaker	Institution	Title
2/19	Mark Skandera	Lehigh	Generating functions for induced characters of the hyperoctahedral group
3/4	Yan Zhuang	Davidson College	Counting Permutations by Peaks, Descents, and Cycle Type

Fall 2019

Unless otherwise noted, talks are scheduled on Thursday afternoon, 2:15–3:15, in Phillips Hall (801 22nd St NW), room 110.

Date	Speaker	Institution	Title
Special summer seminar Wednesday 8/7, 11–12 Rome 771	Sunita Chepuri	UMN	Plabic R-Matrices
Friday 8/30, 4–5pm Rome 771	Dan Cranston	VCU	Using the Potential Method to Color Near-Bipartite Graphs
9/5	Joel Lewis	GWU	Counting reflections in complex reflection groups
9/12	Joe Bonin	GWU	The natural matroid of a polymatroid
9/26	Geir Agnarsson	George Mason	Doubly weighted rooted trees and computer networks
10/3	Michael Hoffman	USNA	Multiple Zeta Values, Iterated Integrals, and Labeled Posets
10/10	Vasu Tewari	UPenn	Divided symmetrization and Schubert polynomials
10/17	Will Traves	USNA	Equations for Matroid Varieties
10/24	Richard Darling	Math Research Group, NSA	K-Nearest Neighbor Approximation Via the Friend-of-a-Friend Principle
Tuesday 10/29, 1–2pm	Carolyn Chun	USNA	Graphs and binary matroids whose odd circuits all have size three or five
11/7	Lou Shapiro	Howard	Trees, Leafs, Logs, Palindromes, and the Riordan Group
11/14	Kevin Long	GWU	The Free Cone and its relation to matroid invariants
11/21	Ryan Vinroot	William and Mary	Counting real conjugacy classes with generating functions

The seminar is co-organized by Joe Bonin and Joel Lewis. For titles and abstracts from past seminars, see the combinatorics seminar archive.