The existence of periodic solutions of an autonomous second order non-linear differential equation
G. J. Butler (1974)
Annales Polonici Mathematici
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G. J. Butler (1974)
Annales Polonici Mathematici
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P. Franklin (1929)
Mathematische Zeitschrift
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Stanisław Sędziwy (1972)
Annales Polonici Mathematici
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J. Ligęza (1977)
Annales Polonici Mathematici
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Klaus Schmitt (1967)
Mathematische Zeitschrift
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Hans Günzler (1967)
Mathematische Zeitschrift
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G. J. Butler, H. I. Freedman (1979)
Annales Polonici Mathematici
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Paul Milnes (1984/85)
Mathematische Zeitschrift
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F. H. Szafraniec (1969)
Annales Polonici Mathematici
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S. Sędziwy (1965)
Annales Polonici Mathematici
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Vesselin Petkov, Gregori Popov (1995)
Mathematische Zeitschrift
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Makay, Géza (2000)
Electronic Journal of Qualitative Theory of Differential Equations [electronic only]
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Takashi Matsuoka (1982/83)
Inventiones mathematicae
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Zhanyong Li, Qihuai Liu, Kelei Zhang (2020)
Applications of Mathematics
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In many engineering problems, when studying the existence of periodic solutions to a nonlinear system with a small parameter via the local averaging theorem, it is necessary to verify some properties of the fundamental solution matrix to the corresponding linearized system along the periodic solution of the unperturbed system. But sometimes, it is difficult or it requires a lot of calculations. In this paper, a few simple and effective methods are introduced to investigate the existence...