Abstract
In this paper, we study the periodic solutions to a type of differential delay equations with 2k − 1 lags. The 4k-periodic solutions are obtained by using the variational method and the method of Kaplan-Yorke coupling system. This is a new type of differential delay equations compared with all the previous researches. And this paper provides a theoretical basis for the study of differential delay equations. An example is given to demonstrate our main results.
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This subject is supported by the National Natural Science Foundations of China (No. 61179031).
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Li, L., Sun, Hf. & Ge, Wg. Multiple Periodic Solutions of Differential Delay Equations with 2k − 1 Lags. Acta Math. Appl. Sin. Engl. Ser. 36, 390–400 (2020). https://doi.org/10.1007/s10255-020-0946-z
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DOI: https://doi.org/10.1007/s10255-020-0946-z