As has been said by Hutanu, "from the point of view of termodinamics, in the case of a reversible process, the system must to return in the initial state "by the same way" by wich it passed (by the same transformations) from this state in the final state. ###>La réussite de la persuation est déterminée par la qualit é des arguments (tout, mais) et par le prestige de l’émetteur (l’ange).