Problemi gerarchici di punti di Nash: Esistenza e approssimazione nel caso di unicita al livello inferiore

In this paper a two level optimization problem, in which the problem of inferior level is a Nash-problem with general constraints (rappresented by multifunctions) and with a unique solution, is considered. On the problem of inferior level approximation results of the solution are proved, on the problem of superior level existence and approximation results of the solutions are proved.