Combinatorics Seminar Fall 2020

Mondays 4-5pm online

Date	Speaker	Title
September 14	Mariel Supina (UC Berkeley)	The universal valuation of Coxeter matroids
September 21	Nathan Lesnevich (Wash U)	Positivity Among P-Partition Generating Functions
September 28	Alexander Diaz-Lopez (Villanova U)	Peaks and descents of permutations: A story with open questions
October 5	Rafael González D'León (Sergio Arboleda)	Whitney duals and Whitney twins: a plausible approach to questions related to Whitney numbers
October 12	Mark Colarusso (S Alabama)	Partitions and Paths: The Combinatorics of Orbits of a 'Little' Borel Subgroup on the Flag Variety
October 26 at 4:40pm	Alex Woo (U Idaho)	Hultman elements for type B
November 2	Andrés Vindas Meléndez (U Kentucky)	Decompositions of the h*-polynomial for rational polytopes
November 9	Melissa Sherman-Bennett (Harvard)	Kazhdan-Lusztig immanants and k-positive matrices
November 16	Clifford Smyth (UNC Greensboro)	Combinatorial formulas for restricted Stirling and Lah number matrices and their inverses
November 23	Eric Sommers (U Mass Amherst)	Generating the nilpotent equivalence relation on Dyck paths
December 7	Jacob Matherne (U Oregon)	Singular Hodge theory of matroids

The seminar is co-organized by Laura Escobar, Martha Precup, and John Shareshian