A branching method for studying stability of a solution to a delay differential equation.
A class of Hamiltonian systems with increasing periods.
A class of nonlinear differential equations on the space of symmetric matrices.
A class of singularly perturbed evolution systems.
A contribution to the problem of coexistence of two periodical solutions of the Hill's equation
A counterexample to the periodic orbit conjecture
A Floquet-Liapunov theorem in Fréchet spaces
A min-max theorem and its applications to nonconservative systems.
A multiplicity result for periodic solutions to higher-order ordinary differential equations via the method of upper and lower solutions.
A Nearly-Periodic Boundary Value Problem for Second Order Differential Equations
A nonlinear periodic system with nonsmooth potential of indefinite sign
In this paper we consider a nonlinear periodic system driven by the vector ordinary -Laplacian and having a nonsmooth locally Lipschitz potential, which is positively homogeneous. Using a variational approach which exploits the homogeneity of the potential, we establish the existence of a nonconstant solution.
A note on bounded, periodic and stable solutions of differential equations
A note on existence of bounded solutions of an -th order ODE on the real line
A note on nonuniform nonresonance for jumping nonlinearities
A note on periodic solution of second order non-linear differential equations
A note on periodic solutions of functional differential equations.
A note on periodic solutions of second order nonautonomous singular coupled systems.
A note on rapid convergence of approximate solutions for second order periodic boundary value problems
In this paper, we develop a generalized quasilinearization technique for a nonlinear second order periodic boundary value problem and obtain a sequence of approximate solutions converging uniformly and quadratically to a solution of the problem. Then we improve the convergence of the sequence of approximate solutions by establishing the convergence of order
A note on solutions of semilinear equations at resonance in a cone
A connection between the Landesman-Lazer condition and the solvability of the equation Lx = N(x) in a cone with a noninvertible linear operator L is studied. The result is based on the abstract framework from [5], applied to the existence of periodic solutions of ordinary differential equations, and compared with theorems by Santanilla (see [7]).
A Note on the Covergence of Solutions of a System of Differential Equations. (Short Communication).