Geodesic
On the existence and uniqueness of solutions of optimal control problems of linear distributed systems which are not solved with respect to the time derivative
Izvestiya. Mathematics , Tome 75 (2011) no. 2, pp. 395-412

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We investigate optimal control problems for linear distributed systems which are not solved with respect to the time derivative and whose homogeneous part admits a degenerate strongly continuous solution semigroup. To this end, we first obtain theorems on the existence of a unique strong solution of the Cauchy problem. This enables us to formulate sufficient conditions for the solubility of the optimal control problems under consideration. In contrast to earlier papers on a similar topic, we substantially weaken the conditions on the quality functional with respect to the state function. The abstract results thus obtained are illustrated by an example of an optimal control problem for the linearized system of Navier–Stokes equations.
Keywords: optimal control problem, distributed system, equation of Sobolev type, degenerate operator semigroup, unique solubility. 
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     title = {On the existence and uniqueness of solutions of optimal control problems of linear distributed systems which are not solved with respect to the time derivative},
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M. V. Plekhanova; V. E. Fedorov. On the existence and uniqueness of solutions of optimal control problems of linear distributed systems which are not solved with respect to the time derivative. Izvestiya. Mathematics , Tome 75 (2011) no. 2, pp. 395-412. http://geodesic.mathdoc.fr/item/IM2_2011_75_2_a6/