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Algebra, Geometry and Cryptology Seminar

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Fall 2017
Fridays, 3:00-3:50
Location: MB124

The Algebra, Geometry and Cryptology (AGC) Seminar meets on selected Fridays, dates indicated below. The seminar is organized by Zach Teitler <>.

  • Taking the seminar for credit
    The seminar may be taken for credit as Math 498. For information about receiving credit, contact
  • Everybody is welcome!
    Everybody interested is welcome to attend and participate! Enrollment for credit is not required. We welcome students to attend and present in the seminar. Attending seminars and colloquium presentations is an excellent way to learn about research topics and senior thesis topics.
  • AGC Seminar mailing list
    Announcements of upcoming seminars are sent by email to all interested participants. To be added to the AGC Seminar mailing list, contact

August 25:

Open problems & Planning

September 1:

Topology Seminar

September 8:

Scott Andrews, Boise State University
The $q,t$-Catalan numbers
The Catalan numbers $C_n$ enumerate many different combinatorial objects, including triangulations of an $(n+2)$-gon, 123-avoiding permutations, and Dyck paths. There are two $q$-analogues of the Catalan numbers, both of which turn out to be specializations of the more general $q,t$-Catalan numbers. In this talk I will introduce the Catalan numbers and the idea of a $q$-analogue of a number and I will define the $q,t$-Catalan numbers.

September 15:

Topology Seminar

September 22:

Zach Teitler, Boise State University
Recent* advances in Waring rank and apolarity

September 29:

Topology Seminar

October 6:

Zach Teitler, Boise State University
High-rank and maximum-rank geometry

October 13:

Aaron Bertram, University of Utah
The Tropical Nullstellensatz
The (weak) Hilbert Nullstellensatz states that if a system of polynomial equations in several variables has no complex solutions then the equation $1 = 0$ must be a combination of the polynomial equations in the system. In this talk, I will discuss a version of this theorem that holds when complex numbers are replaced with tropical numbers. This is joint work with Rob Easton.

October 20:

Jonny Comes, College of Idaho
The Heisenberg category: diagram calculus for induction and restriction functors
In 2010 Khovanov introduced the so-called Heisenberg category H. Among other things, H provides a diagrammatic setting for calculations involving induction and restriction functors for the symmetric groups. This talk will be an introduction to the Heisenberg category following Brundan’s more recent treatment. I will start with an introduction to induction and restriction for the symmetric groups. In particular, I will describe a combinatorial interpretation of induction and restriction in terms of arrays of boxes known as Young diagrams. This will lead us to the so-called “Mackey decomposition” for the symmetric group. I will then explain Brundan’s definition of H and its connection to induction and restriction. If time permits, I will discuss Khovanov’s motivation or describe one of my current projects related to this stuff.

October 27:

Topology Seminar

November 3:

Cassandra Peterson, Boise State University
Statistics and climate change
Several recent developments in statistics are directly related to and used to evaluate climate change.

November 10:

Topology Seminar

November 17:

No seminar meeting

November 24:

No seminar meeting (Thanksgiving holiday)

December 1:

Marion Scheepers, Boise State University

December 8:


Previous semesters:

Spring 2017 Fall 2016 Spring 2016
Fall 2015 Spring 2015 Fall 2014 Spring 2014
Fall 2013 Spring 2013 Fall 2012 Spring 2012
Fall 2011 Spring 2011 Fall 2010