Results 21 to 30 of about 3,049,692 (344)

Positive almost periodic type solutions to a class of nonlinear difference equation

Electronic Journal of Qualitative Theory of Differential Equations, 2011
This paper is concerned with positive almost periodic type solutions to a class of nonlinear difference equation with delay. By using a fixed point theorem in partially ordered Banach spaces, we establish several theorems about the existence and ...
Huisheng Ding, Jiu-Dong Fu, Gaston N'Guérékata   +2 more
doaj   +1 more source

Novel stability criteria on nonlinear density-dependent mortality Nicholson’s blowflies systems in asymptotically almost periodic environments

, 2020
In this paper, we consider nonlinear density-dependent mortality Nicholson’s blowflies system involving patch structures and asymptotically almost periodic environments.
Chaofan Qian, Yuhui Hu
semanticscholar   +1 more source

Linear Schrödinger Equation with an Almost Periodic Potential [PDF]

SIAM Journal on Mathematical Analysis, 2019
We study the reducibility of a Linear Schrodinger equation subject to a small unbounded almost-periodic perturbation which is analytic in time and space.
Riccardo Montalto, M. Procesi
semanticscholar   +1 more source

Cocycles and Almost Periodicity [PDF]

Journal of the London Mathematical Society, 1987
Let G be a compact abelian group containing, as a dense subgroup, the image of \({\mathbb{R}}\) by a continuous injective homomorphism, say \(\alpha\). A cocycle on G is defined here as a unitary \((=\) of modulus 1) continuous function on \(G\times {\mathbb{R}}\) satisfying the identity \(Y(g,s+t)=Y(g,s)Y(g+\alpha (s),t)\). A cocycle is called trivial
openaire   +1 more source

Almost periodic sequences and functions with given values [PDF]

, 2011
summary:We present a method for constructing almost periodic sequences and functions with values in a metric space. Applying this method, we find almost periodic sequences and functions with prescribed values.
Veselý, Michal
core   +1 more source

Non-almost periodic solutions of limit periodic and almost periodic homogeneous linear difference systems

Electronic Journal of Qualitative Theory of Differential Equations, 2015
We study limit periodic and almost periodic homogeneous linear difference systems. The coefficient matrices of the considered systems are taken from a given commutative group.
Martin Chvátal
doaj   +1 more source

Composition Theorems of Stepanov Almost Periodic Functions and Stepanov-Like Pseudo-Almost Periodic Functions

Advances in Difference Equations, 2011
We establish a composition theorem of Stepanov almost periodic functions, and, with its help, a composition theorem of Stepanov-like pseudo almost periodic functions is obtained.
Hui-Sheng Ding, Wei Long
doaj   +2 more sources

Asymptotically almost periodic solutions of limit and almost periodic linear difference systems

Electronic Journal of Qualitative Theory of Differential Equations, 2015
In this paper, limit periodic and almost periodic homogeneous linear difference systems are considered. We study the systems in which the coefficient matrices are taken from a given bounded group and the elements of the matrices are from an infinite ...
Martin Chvátal
doaj   +1 more source

Almost periodic invariant tori for the NLS on the circle [PDF]

Annales de l'Institut Henri Poincare. Analyse non linéar, 2019
In this paper we study the existence and linear stability of almost periodic solutions for a NLS equation on the circle with external parameters. Starting from the seminal result of Bourgain (2005) on the quintic NLS, we propose a novel approach allowing
L. Biasco, Jessica Elisa Massetti, M. Procesi   +2 more
semanticscholar   +1 more source

Almost periodic solutions with a prescribed spectrum of systems of linear and quasilinear differential equations with almost periodic coefficients and constant time lag (Fourier transform approach) [PDF]

, 2004
summary:This paper is a continuation of my previous paper in Mathematica Bohemica and solves the same problem but by means of another method. It deals with almost periodic solutions of a certain type of almost periodic systems of differential ...
Fischer, Alexandr
core   +1 more source