Counting weighted maximal chains in the circular Bruhat order

Gopal Goel, Olivia McGough, David Perkinson

The totally nonnegative Grassmannian $\mathrm{Gr}(k,n{)}_{\ge 0}$ is the subset of the real Grassmannian $\mathrm{Gr}(k,n)$ consisting of points with all nonnegative Plücker coordina…