On Invariant Closed Curves for One-Step Methods.
On limit properties of phases and of central dispersions in the oscillatory equation with a periodic coefficient
On minimal periods of functional-differential equations and difference inclusions
We prove several results on lower bounds for the periods of periodic solutions of some classes of functional-differential equations in Hilbert and Banach spaces and difference inclusions in Hilbert spaces.
On non-existence of periodic solutions of an important differential equation
On nth-order differential operators with Bohr-Neugebauer type property.
On oscillation of solutions of nonlinear retarded differential equation of Emden-Fowler type
On periodic oscillations for a class of feedback control systems in Hilbert spaces
In this paper, by using the topological degree theory for multivalued maps and the method of guiding functions in Hilbert spaces we deal with the existence of periodic oscillations for a class of feedback control systems in Hilbert spaces.
On periodic solutions of a class of second order nonautonomous systems with nonhomogeneous potentials indefinite in sign
On periodic solutions of abstract differential equations.
On periodic solutions of first order nonlinear differential equations with deviating arguments.
On periodic solutions of non-autonomous second order Hamiltonian systems
The purpose of this paper is to study the existence of periodic solutions for the non-autonomous second order Hamiltonian system Some new existence theorems are obtained by the least action principle.
On periodic solutions of nonlinear second order ordinary differential equations
On periodic solutions of superquadratic Hamiltonian systems.
On periodic solutions of systems of linear functional-differential equations
This paper deals with the system of functional-differential equations where is a linear bounded operator, , and and are spaces of -dimensional -periodic vector functions with continuous and integrable on components, respectively. Conditions which guarantee the existence of a unique -periodic solution and continuous dependence of that solution on the right hand side of the system considered are established.
On periodic solutions to nonlinear functional-differential equations.
On periodic solutions to systems of linear functional-differential equations.
On periodic-type solutions of systems of linear ordinary differential equations.
On perturbations of deviations of periodic differential-difference equations in Banach spaces
On Pontryagin-Rodygin's theorem for convergence of solutions of slow and fast systems.
On properties of derivatives of the basic central dispersion in an oscillatory equation with an almost periodic coefficient