ON THE EXISTENCE OF AN INTEGRAL MANIFOLD OF A SPECIAL TYPE OF A SOME NONLINEAR DIFFERENTIAL SYSTEM
Journal Title: Дослідження в математиці і механіці - Year 2015, Vol 20, Issue 2
Abstract
A nonlinear system of the differential equations is considered. This system is a linear extension of the nonlinear differential equation on a circle. The coefficients of the system belong to the class F, which are the functions that can be represented in the form of the absolutely and uniformly convergent Fourier series on the entire axis with slowly varying coefficients in a certain sense and frequencies. The basic properties of this functions’ class are investigated. This system is expected as a close one to an inhomogeneous linear system of the differential equations with a diagonal matrix of the slowly varying coefficients and free terms, belonging to the class F. The transformations with the coefficients of class F, causing the system to a system in which the frequency is determined from the nonlinear equations with slowly varying coefficients, are constructed using the contraction mapping principle. As a result, the conditions, under which the original system has an integral manifold of class F, are considered.
Authors and Affiliations
S. A. Shchogolev
Keywords
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