We consider a nonautonomous system of ordinary differential equations. It is supposed that this system has a periodic solution. We establish the lower bound for the period of this solution.
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Translated from Ukrains’kyi Matematychnyi Zhurnal, Vol. 67, No. 11, pp. 1569–1572, November, 2015.
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Ignat’ev, A.O. Bounds for the Periods of Periodic Solutions of Ordinary Differential Equations. Ukr Math J 67, 1773–1777 (2016). https://doi.org/10.1007/s11253-016-1188-3
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DOI: https://doi.org/10.1007/s11253-016-1188-3