On an Analogue of a Property of Singular $M$-matrices, for the Lyapunov and the Stein Operators

A. M. Encinas, Samir Mondal, K. C. Sivakumar

In the setting of real square matrices, it is known that, if $A$ is a singular irreducible $M$-matrix, then the only nonnegative vector that belongs to the range space of $A$ is th…