Ehrenfest Theorem

States that the expected value of quantum measurements approach classical predictions. A specific case of the generalized Ehrenfest theorem

$m\frac{\mathrm{d}⟨x⟩}{\mathrm{d}t}=⟨p⟩$

$\frac{\mathrm{d}⟨p⟩}{\mathrm{d}t}=-\nabla U$