W 
September 15  
Everybody

   Open Session


F 
September 17  
Bridget Eileen Tenner

   A nonmessingup phenomenon for posets


F 
September 24  
Michael Huber

   The classification of flagtransitive Steiner designs


W 
September 29  
Dylan Thurston

   From dominoes to hexagons


W 
October 06  
Guoce Xin

   On MacMahon's partition analysis


W 
October 13  
Cilanne Boulet

   A new combinatorial proof of the RogersRamanujan identities


F 
October 15  
Allen Knutson

   The glue between Young tableaux


W 
October 20  
Timothy Chow

   Chess tableaux and chess problems


F 
October 22  
Masahiko Yoshinaga

   On the freeness of truncated affine Weyl arrangements


W 
October 27  
Eric Sommers

   Exponents for ideals of positive roots


F 
October 29  
Richard Stanley

   Crossings and nestings of matchings and partitions


W 
November 10  
Andrei Zelevinsky

   Cluster algebras of finite type and positive symmetrizable matrices


F 
November 12  
Andrei Okounkov

   Quantum cohomology of the Hilbert scheme of points in the plane


W 
November 17  
Satyan Devadoss

   Graphassociahedra


F 
November 19  
Jonathan Farley

   Tensor products of semilattices, semimodularity and supersolvability: a problem of E. T. Schmidt from 1974 and some conjectures of Quackenbush from 1985


W 
November 24  
Eric Rains

   BC_nsymmetric polynomials


M 
November 29  
Louis Billera

   Relations among ribbon Schur functions


F 
December 03  
Mihai Ciucu

   A random tiling model for two dimensional electrostatics II: arbitrary charge distributions under periodic boundary conditions


W 
December 08  
Jim Haglund

   A combinatorial model for the Macdonald polynomials


F 
December 10  
Arthur Benjamin

   Vandermonde's Determinant and Fibonacci SAWs

