O периодических решениях систем дифференциальных уравнений второго порядка
On a coincidence of central dispersions of the first and second kind in connection with periodic solutions of the differential equation
On a maximal number of period annuli.
On a nonlinear second order periodic boundaryvalue problem with Carathéodory functions
The periodic boundary value problem u''(t) = f(t,u(t),u'(t)) with u(0) = u(2π) and u'(0) = u'(2π) is studied using the generalized method of upper and lower solutions, where f is a Carathéodory function satisfying a Nagumo condition. The existence of solutions is obtained under suitable conditions on f. The results improve and generalize the work of M.-X. Wang et al. [5].
On boundary value problems of periodic type for ordinary odd order differential equations
On centers of type of polynomial systems
On conditioning of Schur complements of H-TFETI clusters for 2D problems governed by Laplacian
Bounds on the spectrum of the Schur complements of subdomain stiffness matrices with respect to the interior variables are key ingredients in the analysis of many domain decomposition methods. Here we are interested in the analysis of floating clusters, i.e. subdomains without prescribed Dirichlet conditions that are decomposed into still smaller subdomains glued on primal level in some nodes and/or by some averages. We give the estimates of the regular condition number of the Schur complements...
On critical points for noncoercive functionals and subharmonic solutions of some Hamiltonian systems.
On Existence of Positive Periodic Solutions.
On forced periodic oscillations in dissipative Liénard systems
On generalized periodic solutions of linear differential equations of order n
On geometric detection of periodic solutions and chaotic dynamics.
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