
doi: 10.1137/0309024
Properties of the minimal-time function are considered for the problem of reaching the origin within (linear autonomous finite-dimensional) control systems. The function’s continuity is first established, leading to the construction of optimal feedback controls for normal systems. For systems where the control matrix has maximal rank (= dimension of state space), the minimal-time function is locally Lipschitzian, and hence differentiable almost everywhere.
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