Abstract:
Lower and upper estimates are obtained for the reachable set of a nonautonomous control system. Ellipsoidal estimates of the reachable set are used for an upper estimate of the duration of a time optimal move from an arbitrary fixed set $M_0$ to a given set $M_1$ and for the construction of a control carrying $M_0$ to $M_1$ in the estimated time span.
Bibliography: 10 titles.