ABSTRACT. In this paper we study dynamical systems embedded in a conservative field of forces, whose potential is "singular." We look for T-periodic solutions of these systems by variational methods. Introduction.In this paper we look for T-periodic solutions of the Lagrangian system of ordinary differential equations:where the Lagrangian function C(t,q, £) is given, as usual, byÍGR, q,£eRN, and dij(t,q), bi(t,q), c(t,q), V(t,q) are C1 real-valued functions, T-periodic in t. Moreover we suppose that the "potential" V(t,q) is defined in R x fi, where fi is an open subset of Rw, and V{t,q) -► -oo as?-» dQ. Many authors have studied this problem in the case when fi = R^ (so dQ = 0) under various assumptions on the growth of V(t,q) as \q\ -► oo: cf., for instance, [2, 3, 5, 9, 10]. W. B. Gordon was the first to study our case by means of variational methods, and we refer to [6,7] for the physical motivation of the problem (cf. also the end of this section). Finally we refer to [1,8] for the case V(t,q) -► +oo as q^dQ {Ü¿RN).In this paper we suppose that:
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