Stability in affine optimal control problems constrained by semilinear elliptic partial differential equations

Abstract

This paper investigates stability properties of a ne optimal control problems constrained by semilinear elliptic partial di erential equations. This is done by studying the so called metric subregularity of the set-valued mapping associated with the system of rst order necessary optimality conditions. Preliminary results concerning the di erentiability of the functions involved are established, especially the so-called switching function. Using this ansatz, more general nonlinear perturbations are encompassed, and under weaker assumptions, than the ones previously considered in the literature on control constrained elliptic problems. Finally, the applicability of the results is illustrated with some error estimates for the Tikhonov regularization.