Abstract
The unitary group describing the evolution of the quantum fluctuation around any classic phase orbit has a perturbative strongly asymptotic expansion in the small parameter h z.shtsls; 1 2 . Likewise, the mean values of the observables position and momentum in suitable time-dependent states have an asymptotic expansion in h z.shtsls; 1 2 , whose zeroth-order term satisfies the classic canonical equations. Similar expansions are found for the squared quantum dispersions.
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