Rational functions and real Schubert calculus
Alexandre Erëmenko, Andrei M. Gabrielov, Michael Zalmanovich Shapiro, Alek Vainshtein · Proceedings of the American Mathematical Society · 2005
We single out some problems of Schubert calculus of subspaces of codimension $2$ that have the property that all their solutions are real whenever the data are real. Our arguments explore the connection between subspaces of codimension $2$ and rational functions of one variable.