Abstract. In this paper we consider a nonlinear evolution reactiondiffusion system governed by multi-valued perturbations of m-dissipative operators, generators of nonlinear semigroups of contractions. Let X and Y be real Banach spaces, K be a nonempty and locally closed subsetY a nonempty, convex and closed valued, strongly-weakly upper semi-continuous (u.s.c.) multi-function. We prove a necessary and a sufficient condition in order that for each (τ, ξ, η) ∈ K, the next system
Mathematics Subject Classification (2000). Primary 34G20, 47J35, 35K57; Secondary 35K45, 35K65.