Demazure Flags, Chebyshev polynomials, Partial and Mock theta functions

Rekha Biswal, Vyjayanthi Chari, Lisa Schneider +1

We study the level $m$--Demazure flag of a level $\ell$--Demazure module for ${\mathfrak{sl}}_2[t]$. We define the generating series $A_n^{\ell \to m}(x,q)$ which encodes the $q$…