ON THE WORST SCENARIO METHOD: APPLICATION TO A QUASILINEAR ELLIPTIC 2D-PROBLEM WITH

摘要

We apply a theoretical framework for solving a class of worst scenario problems to a problem with a nonlinear partial differential equation. In contrast to the onedimensional problem investigated by P. Harasim in Appl. Math. 53 (2008), No. 6, 583-598, the two-dimensional problem requires stronger assumptions restricting the admissible set to ensure the monotonicity of the nonlinear operator in the examined state problem, and, as a result, to show the existence and uniqueness of the state solution. The existence of the worst scenario is proved through the convergence of a sequence of approximate worst scenarios. Furthermore, it is shown that the Galerkin approximation of the state solution can be calculated by means of the Kachanov method as the limit of a sequence of solutions to linearized problems.