Щёголев, Сергей АвенировичКарапетров, Валентин ВіталійовичЩоголев, Сергій АвеніровичКарапетров, В. В.Shchogolev, Sergiy A.Karapetrov, V. V.2021-08-122021-08-122020Дослідження в математиці і механіці = Researches in mathematics and mechanicshttps://dspace.onu.edu.ua/handle/123456789/31476Для квазилинейного матричного дифференциального уравнения, коэффициенты которого представимы в виде абсолютно и равномерно сходящихся рядов Фурье с медленно меняющимися коэффициентами и частотой, получены достаточные условия существования решения аналогичной структурыДля квазiлiнiйного матричного диференцiального рiвняння, коефiцiєнти якого зображуванi у виглядi абсолютно та рiвномiрно збiжних рядiв Фур’є з повiльно змiнними коефiцiєнтами та частотою, отримано достатнi умови iснування розв’язку аналогiчної структури.In the mathematical description of various phenomena and processes that arise in mathematical physics, electrical engineering, economics, one has to deal with matrix differential equations. Therefore, these equations are relevant both for mathematicians and for specialists in other areas of natural science. Many studies are devoted to them, in which the solvability of matrix equations in various function spaces, boundary value problems for matrix differential equations, and other problems were investigated. In this article, a quasilinear matrix equation is considered, the coefficients of which can be represented in the form of absolutely and uniformly converging Fourier series with coefficients and frequency slowly varying in a certain sense. The problem is posed of obtaining sufficient conditions for the existence of particular solutions of a similar structure for the equation under consideration. For this purpose, the corresponding linear equation is considered first. It is written down in component-wise form, and, based on the assumptions made, the existence of the only particular solution of the specified structure is proved. Then, using the method of successive approximations and the principle of contracting mappings, the existence of a unique particular solution of the indicated structure for the original quasilinear equation are proved.ruматрицадифференциальное уравнениеквазилинейныйматрицядиференцiальне рiвнянняквазiлiнiйнийmatrixdifferential equationquasilinearArticle