F. Camilli et A. Siconolfi, DISCONTINUOUS SOLUTIONS OF A HAMILTON-JACOBI EQUATION WITH INFINITE SPEED OF PROPAGATION, SIAM journal on mathematical analysis, 28(6), 1997, pp. 1420-1445
A(x) is a positive locally Lipschitz map from R-N to the space of symm
etric matrices. Since no growth condition on A is assumed, pathologica
l phenomena can occur. We study the problem in the framework of discon
tinuous viscosity solutions and we get some comparison results and a r
epresentation formula for the minimal solution of the problem.