Universal Plücker coordinates for the Wronski map and positivity in real Schubert calculus

Steven N. Karp, Kevin Purbhoo

Given a $d$-dimensional vector space $V\subset \mathbb{C}[u]$ of polynomials, its Wronskian is the polynomial $(u+z_1)\cdots (u+z_n)$ whose zeros $-z_i$ are the points of $\m…