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Revision difference : controllability
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A control system is said to be (completely) controllable if, for all initial times and all initial states, there exists some input function (or sequence for discrete systems) that drives the state vector to any final state at some finite time. A control system is said to be (completely) controllable if, for all initial times and all initial states, there exists some input function (or sequence for discrete systems) that drives the state vector to any final state at some finite time.