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Optimality conditions for controls of semilinear evolution systems with mixed constraints
In this paper, we study an optimal control problem for
semilinear evolution equations with a mixed constraint of the state and the
control. One of the motivations is the problem with a state dependent control
domain. Our main result is the Pontryagin type necessary conditions for the
optimal controls. The main tools we use are the Ekeland variational principle
and the spike perturbation technique.