Geodesic
Error estimates for the finite element discretization of semi-infinite elliptic optimal control problems
Discussiones Mathematicae. Differential Inclusions, Control and Optimization, Tome 30 (2010) no. 2, pp. 221-236.

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In this paper we derive a priori error estimates for linear-quadratic elliptic optimal control problems with finite dimensional control space and state constraints in the whole domain, which can be written as semi-infinite optimization problems. Numerical experiments are conducted to ilustrate our theory.
Keywords: elliptic optimal control problem, state constraints, error estimates, finite element discretization 
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Merino, Pedro; Neitzel, Ira; Tröltzsch, Fredi. Error estimates for the finite element discretization of semi-infinite elliptic optimal control problems. Discussiones Mathematicae. Differential Inclusions, Control and Optimization, Tome 30 (2010) no. 2, pp. 221-236. http://geodesic.mathdoc.fr/item/DMDICO_2010_30_2_a3/

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