“…In [6], motivated by earlier publications [2,7,11], the authors extended the notion of viscosity solution to these problems and proved that their value functions are viscosity solutions of a weakly coupled system of Hamilton-Jacobi equations. Recently, several authors have investigated random switching problems, their weakly coupled Hamilton-Jacobi equations [19], the corresponding extensions of the weak KAM and Aubry-Mather theories [10,17], the long-time behavior of solutions [3,4,18,20,22], and homogenization questions [21]. In these references, as in the present paper, the state of the systems has different modes.…”