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A new approach to perturbation theory in the quantum phase-space formalism is proposed, in order to devise some approximated description of the quantum phase-space dynamics, which is not directly related to the usual semi-classical approximation. A general class of equivalent quasi-distribution functions based on the Wigner-Moyal formalism is considered and a first-order invariant formulation of the dynamics is obtained. The relationship between the various phase-space representations is expressed...
Su quale terreno può rotolare senza scivolare una ruota non circolare? Sulla questione, di cui si sono interessate le cronache perché è stata proposta come tema agli esami della Scuola Media Superiore del 2017, richiamiamo alcune proposte presenti in letteratura e formuliamo qualche ulteriore osservazione.
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