The Applied Algebra Seminar
A Monday afternoon research seminar

About the seminar (click here to see more)

The seminar is currently organized by Cesar Ceballos and Nantel Bergeron.

The seminar has been running since 1997. The topics of talks have typically been any mixture of algebra with any other field: combinatorics, geometry, topology, physics, etc. Further down this page you will find links to the seminar webpages for previous years. The audience usually consists of 6–12 people, including several graduate students and post-docs. For this reason, speakers are encouraged to devote a portion of their talk to the suggestion of open problems and the directions for research in their area. If you are interested in speaking at the seminar, contact Cesar Ceballos or Nantel Bergeron.

You may also be interested in the Algebraic Combinatorics Seminar at the Fields Institute.


Dates are listed in reverse-chronological order. Unless otherwise indicated, all talks will take place on Monday from 15:00-16:00 in N638 Ross Building (York University).

Date Speaker Title (click titles for abstract)
6 Apr. 2015
Jim Haglund
(U. of Pennsylvania)
30 Mar. 2015
Hugh Thomas
(U. of New Brunswick)
9 Feb. 2015
Ryan Kaliszewski
(Drexel U.)
26 Jan. 2015
Greg Warrington
(U. of Vermont)
1 Dec. 2014
Diana Ojeda
(U. of Toronto)
24 Nov. 2014
Rafael S. Gonzalez
(U. of Kentucky)
17 Nov. 2014
Yannic Vargas
10 Nov. 2014
3 Nov. 2014
Vincent Genest
(U. de Montréal)
27 Oct. 2014
Kevin Dilks
(U. of Minnesota)
20 Oct. 2014
Salvatore Stella
(North Carolina State U.)
13 Oct. 2014
6 Oct. 2014
Suho Oh
(U. of Michigan)
3 Oct. 2014*
Christophe Hohlweg
29 Sep. 2014
Brendan Pawlowski
(U. of Minnesota)
15 Sep. 2014
Joshua Hallam
(Michigan State U.)
Factorization of the Characteristic Polynomial of a Poset
The characteristic polynomial of a poset is the generating function for the Mbius function of the poset. For some families of posets, the polynomial factors with nonnegative integer roots. We will present a new method which gives a combinatorial explanation for these factorizations. Additionally, we will see how this method can be used to explain a relationship between the generating function for the increasing forests of a graph and its chromatic polynomial. This is joint work with Bruce Sagan.
8 Sep. 2013
Bruce Sagan
(Michigan State U.)
Of antipodes and involutions, of cabbages and kings ...
If H is a connected, graded Hopf algebra, then Takeuchi's formula can be used to compute its antipode. However, there is usually massive cancellation in the result. We show how sign-reversing involutions can sometimes be used to obtain cancellation-free formulas. We apply this idea to the Hopf algebras of polynomials, graphs, and noncommutative symmetric functions. This is joint work with Carolina Benedetti.


Below you will find links to the seminar webpages for previous years.
Year 2013-14 Year 2012-13 Year 2011-12 Year 2010-11
Year 2009-10 Fall 2008 & Winter 2009 Fall 2007 Winter 2006
Fall 2005 Winter 2005 Fall 2004 Winter 2004
Fall 2003 Winter 2003 Fall 2002 Winter 2002
Fall 2001 Winter 2001 Fall 2000 Winter 2000
Fall 1999 Winter 1999 Fall 1998 Winter 1998
Fall 1997