Differential equations involving causal operators with nonlinear periodic boundary conditions
The notion of causal operators is extended to periodic boundary value problems with nonlinear boundary conditions in this paper. By utilizing the monotone iterative technique and the method of lower and upper solutions (resp. weakly coupled lower and upper solutions), we establish the existence of the extremal solutions (resp. weakly coupled extremal quasi-solutions) for nonlinear periodic boundary value problems with causal operators. (C) 2007 Elsevier Ltd. All rights reserved.
causal operators nonlinear periodic boundary conditions lower and upper solutions weakly coupled lower and upper solutions weakly coupled quasi-solutions