Wednesdays, 4–5pm, in Pearce 223.
Webpages from previous semesters: 

Date  Speaker  Affiliation  Title 
9/30  Lisa DeMeyer  Central Michigan University  Graph constructions associated to a semigroup 
10/14  Gabriel Feinberg  Haverford College  Geometry, representation theory, and voting 
10/21  Travis Scrimshaw  University of Minnesota  TBD 
10/28  
11/4  Andrei Minchenko  Weizmann Institute  TBD 
11/11  Kenneth Barrese  University of California, San Diego  TBD 
11/18  George Grossman  Central Michigan University  TBD 
12/2  Emily Gunawan  University of Minnesota  Cluster Algebras from Surface Triangulations 
12/9  Mark Pengitore  Purdue University  TBD 
Speaker: Lisa DeMeyer (Central Michigan University)
Title: Graph constructions associated to a semigroup
Abstract: Given a commutative semigroup $S$ with $0$, the zero divisor graph $\Gamma(S)$ is a graph whose vertices are labeled by the nonzero zero divisors of $S$ and two distinct vertices are adjacent precisely when the product of the corresponding elements in $S$ is $0$. This construction has been widely studied over the past 20 years.
Elementary aspects of the relationship between $S$ and $\Gamma(S)$ will be discussed. Recent and notsorecent results on the clique homology of $\Gamma(S)$ will be presented. The talk will conclude with a brief mention of other fruitful graph constructions associated to $S$ in the current literature.
Speaker: Gabriel Feinberg (Haverford College)
Title: Geometry, representation theory, and voting
Abstract: How much impact does the voting method have on the outcome of an election? Given some commonsense desired characteristics for a system, can we find an "ideal" election process? The answers to these questions, while potentially troubling, are established.
In this talk, I'll introduce a geometric approach of Donald Saari, which leads naturally to these answers. We'll then see how a voting procedure can be considered as a $\mathbb{Q}S_n$module homomorphism. Following the work of Michael Orrison et al., we'll exploit the wellstudied representation theory of the symmetric group to make further observations.
Speaker: Travis Scrimshaw (University of Minnesota)
Title: TBD
Abstract: Coming soon …
Speaker: Andrei Minchenko (Weizmann Institute)
Title: TBD
Abstract: Coming soon …
Speaker: Kenneth Barrese (University of California, San Diego)
Title: TBD
Abstract: Coming soon …
Speaker: George Grossman (Central Michigan University)
Title: TBD
Abstract: Coming soon …
Speaker: Emily Gunawan (University of Minnesota)
Title: Cluster Algebras from Surface Triangulations
Abstract: Coming soon …
Speaker: Mark Pengitore (Purdue University)
Title: TBD
Abstract: Coming soon …