New York Combinatorics Seminar

Graduate Center, CUNY

Fridays 11:00 am - 12:00 am Room 4419 (different from last semester)

This seminar covers a wide range of topics in combinatorics and its applications to other disciplines, especially computer science.

The CUNY Graduate Center is located at 365 Fifth Avenue (at the corner of 34th Street), New York. It can be easily approached by subway, using the B,D,F,N,Q,R, or 6 trains.

Seminar organizers are Kira Adaricheva, Deepak Bal, Jonathan Cutler, Ezra Halleck, Christopher Hanusa, Sandra Kingan, and Kerry Ojakian.

Fall 2016 Talks

Sep 16, 2016: Matthew Hyatt (Pace University)

Title: Frobenius seaweed Lie algebras

Abstract: Meander graphs, introduced by Dergachev and A. Kirillov, provide a method for determining the index of seaweed (also called biparabolic) subalgebras of the special linear Lie algebras. In the case of a Frobenius seaweed, we use the meander to prove that the spectrum of the adjoint of a principal element is an unbroken sequence of integers. Additionally, we show that the sequence of the dimensions of the associated eigenspaces is symmetric. Symplectic seaweed subalgebras enjoy the same properties, and we use symplectic meanders to prove this.

Previous Speakers

Spring 2016
Fall 2015
Spring 2015
Fall 2014
Spring 2014
Fall 2013
Spring 2013
Fall 2012
Spring 2012
Fall 2011
Spring 2011
Previous Talks hosted by Janos Pach