Algebraic Combinatorics Seminar - Aram Dermenjian

Title: Sign variations and descents

Abstract:

In this talk we consider a poset structure on projective sign vectors. We show that the order complex of this poset is partitionable and give an interpretation of the h-vector using type B descents of the type D Coxeter group.
Based on joint work with Nantel Bergeron and John Machacek, and is a continuation of the work by John Machacek. arXiv preprint: 2008.03794