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    Proving Constant Time of "If and, then"

    d<A>/dt=i/h x ([H,A]) + dA/dt Therefore if and dA/dt=0 , then dA/dt=0. Is this it.? :-(
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    Proving Constant Time of "If and, then"

    Homework Statement . Show that if and, thenis constant in time.Homework EquationsThe Attempt at a Solution