Mathematics – Optimization and Control
Scientific paper
2010-03-09
Mathematics
Optimization and Control
Withdrawn due to an error in the proof of Lemma 3.3
Scientific paper
We consider the variational discretization of a linear-quadratic optimal control problem with pointwise control and state constraints. In order to allow for a Fr\'echet smooth norm, the problem is reformulated by means of a reflexive Sobolev space instead of the space of continuous functions. The discretization of the state equation yields a family of perturbed optimal control problems, whose solutions can be computed numerically. We apply an implicit multifunction theorem (IMT) to the first order necessary conditions to proof a bound on the perturbation error for these solutions. In order to verify the abstract regularity condition of the IMT, we compute the Fr\'echet coderivative of a set-valued representation of the necessary conditions. Applying our results to an elliptic state equation in two dimensions, undergoing a simple finite element discretization, we obtain convergence of order O(h).
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