Szukana fraza: [Abstract = "The problem considered is that of minimizing a quadratic cost functional for a discrete distributed system with fixed initial and final states. It is shown that under suitable controllability assumptions, there is a close relationship between this problem and that of exact controllability with minimization of a time\-varying energy criterion. The HUM technique is then extended to treat the exact controllability problem in the time\-varying case and applied to provide an explicit form for the optimal control and the optimal cost."]

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