Geodesic
Relaxation in control systems of subdifferential type
Izvestiya. Mathematics , Tome 70 (2006) no. 1, pp. 121-152

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In a separable Hilbert space we consider a control system with evolution operators that are subdifferentials of a proper convex lower semicontinuous function depending on time. The constraint on the control is given by a multivalued function with non-convex values that is lower semicontinuous with respect to the variable states. Along with the original system we consider the system in which the constraint on the control is the upper semicontinuous convex-valued regularization of the original constraint. We study relations between the solution sets of these systems. As an application we consider a control variational inequality. We give an example of a control system of parabolic type with an obstacle. 
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     title = {Relaxation in control systems of subdifferential type},
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A. A. Tolstonogov. Relaxation in control systems of subdifferential type. Izvestiya. Mathematics , Tome 70 (2006) no. 1, pp. 121-152. http://geodesic.mathdoc.fr/item/IM2_2006_70_1_a5/