Periodic solutions of asymptotically linear systems without symmetry
Periodic solutions of hamiltonian systems of 3-body type
Periodic solutions of non-autonomous Hamiltonian systems with symmetries.
Periodic solutions of non-autonomous second order systems with -Laplacian.
Periodic solutions of perturbed superquadratic hamiltonian systems
Periodic Solutions of Second Order Nonautonomous Systems with the Potentials Changing Sign
Some existence and multiplicity results for periodic solutions of second order nonautonomous systems with the potentials changing sign are presented. The proofs of the existence results rely on the use of a linking theorem and the Mountain Pass theorem by Ambrosetti and Rabinowitz [2]. The multiplicity results are deduced by the study of constrained critical points of minimum or Mountain Pass type.
Periodic solutions of some linear systems of differential equations.
Periodic solutions of some problems of 3-body type
Periodic Solutions of Superquadratic Hamiltonian Systems with Bounded Forcing Terms.
Periodic Solutions on hypersurfaces and a result by C. Viterbo.
Periodic solutions to Maxwell equations in nonlinear media
Periodic solutions with prescribed energy for some keplerian -body problems
Periods for holomorphic maps via Lefschetz numbers.
Permutations; isotropy and smooth cyclic group actions on definite 4-manifolds.
Persistence of invariant manifolds for perturbations of semiflows with symmetry.
Perturbation du laplacien de Hodge par excision de petites boules
Perturbation du spectre (Conditions de Neumann)
Perturbation results for a class of singular Hamiltonian systems
The existence of solutions with prescribed period for a class of Hamiltonian systems with a Keplerian singularity is discussed.
Perturbation theorems on Morse theory for continuous functions.
Perturbations of Critical Values in Nonsmooth Critical Point Theory
* Supported by Ministero dell’Università e della Ricerca Scientifica e Tecnologica (40% – 1993). ** Supported by Ministero dell’Università e della Ricerca Scientifica e Tecnologica (40% – 1993).The perturbation of critical values for continuous functionals is studied. An application to eigenvalue problems for variational inequalities is provided.