Problem about a finding of number of families the locally periodic solutions non-autonomous system of the differential equationsLiskina E. Y. "Математика. Компьютер. Образование". Cб. трудов XI международной конференции. Под общей редакцией Г.Ю. Ризниченко Ижевск: Научно-издательский центр "Регулярная и хаотическая динамика", 2004. Vol. 2. Pp. 474-480. The problem of finding of number of families of the locally nonzero periodic solutions of nonlinear non-autonomous system of the ordinary differential equations is considered. The sufficient conditions of finding of such solutions based on application of a contracting mapping theorem are received.
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