Twist periodic solutions for differential equations with a combined attractive–repulsive singularity☆
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Keywords
Twist periodic solutions
Lyapunov stability
Attractive–repulsive singularity
Third order approximation
Averaging method
Upper and lower solutions
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Jifeng Chu was supported by the National Natural Science Foundation of China (Grant No. 11171090) and the Fundamental Research Funds for the Central Universities (Grant No. 2015B19214). Pedro J. Torres was partially supported by project MTM2011-23652, Ministerio de Economía e Innovación, Spain. Feng Wang was supported by the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (Grant No. 15KJB110001).
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