1. Semismoothness for Solution Operators of Obstacle-Type Variational Inequalities with Applications in Optimal Control
- Author
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Constantin Christof and Gerd Wachsmuth
- Subjects
Control and Optimization ,Optimization and Control (math.OC) ,Applied Mathematics ,FOS: Mathematics ,Mathematics - Optimization and Control ,35J86, 35J87, 49J52, 49K20, 46G05, 49M15 - Abstract
We prove that solution operators of elliptic obstacle-type variational inequalities (or, more generally, locally Lipschitz continuous functions possessing certain pointwise-a.e. convexity properties) are Newton differentiable when considered as maps between suitable Lebesgue spaces and equipped with the strong-weak Bouligand differential as a generalized set-valued derivative. It is shown that this Newton differentiability allows to solve optimal control problems with H1-cost terms and one-sided pointwise control constraints by means of a semismooth Newton method. The superlinear convergence of the resulting algorithm is proved in the infinite-dimensional setting and its mesh independence is demonstrated in numerical experiments. We expect that the findings of this paper are also helpful for the design of numerical solution procedures for quasi-variational inequalities and the optimal control of obstacle-type variational problems., Comment: Minor revisions. Published in SIAM Journal on Control and Optimization, Vol. 61, Iss. 3 (2023)
- Published
- 2023