Szukana fraza: [Abstract = For a complety observable control system governed by a nonlinear ordinary differential equation, we consider dynamical \(real\-time\) observation operators stable with respect to small input perturbations. We treat them as regularizing operators on an appropriate set of well\-posedness. Two solutions order optimal with respect to the perturbation accuracy are described. The tool is based on the idea of guided models from the theory of closed\-loop differential games, and the lower bounds for the unimprovable observation accuracy.]

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