Siai, Abdelmajid2021-05-182021-05-182005-01-12Siai, A. (2005). Nonlinear Neumann problems on bounded Lipschitz domains. <i>Electronic Journal of Differential Equations, 2005</i>(09), pp. 1-16.1072-6691https://hdl.handle.net/10877/13580We prove existence and uniqueness, up to a constant, of an entropy solution to the nonlinear and non homogeneous Neumann problem -div [a(., ∇u)] + β(u) = ƒ in Ω ∂u / ∂va + γ(τu) = g on ∂Ω. Our approach is based essentially on the theory of m-accretive operators in Banach spaces, and in order preserving properties.Text16 pages1 file (.pdf)enAttribution 4.0 InternationalNonlinear Neumann problemm-Completely accretive operatorArticle