Polynomials modulo quasisymmetric polynomials and the class of the permutahedral variety
Speaker:
Vasu Tewari, University of Hawaii at Manoa
Date and Time:
Saturday, January 22, 2022 - 1:30pm to 1:50pm
Location:
online
Abstract:
I will talk about a new basis of the polynomial ring that refines Schubert polynomials. This basis is inspired by work of Aval-Bergeron-Bergeron in the context of reducing polynomials modulo the ideal of positive degree quasisymmetric polyomials. We use this to find a manifestly nonnegative integral expansion for the class of the permutahedral variety in terms of Schubert classes, with a novel parking procedure playing a key role.