Optimal behavior of the support of the solutions to a class of degenerate parabolic systems

In this paper we deal with a class of degenerate/singular quasilinear parabolic systems. We study a Cauchy problem in $ R^N$ with an initial datum in $ L^1$. Sharp $L^infty$ estimates are proved. In the degenerate case, assuming that the initial datum has compact support, we prove the optimal speed of propagation of the support.