Note on the existence of periodic solutions of a second order differential equation
F. H. Szafraniec (1969)
Annales Polonici Mathematici
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F. H. Szafraniec (1969)
Annales Polonici Mathematici
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G. J. Butler (1974)
Annales Polonici Mathematici
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J. Ligęza (1977)
Annales Polonici Mathematici
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G. J. Butler, H. I. Freedman (1979)
Annales Polonici Mathematici
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Stanisław Sędziwy (1972)
Annales Polonici Mathematici
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Makay, Géza (2000)
Electronic Journal of Qualitative Theory of Differential Equations [electronic only]
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Bahman Mehri (1977)
Archivum Mathematicum
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Fabio Zanolin (1981)
Rendiconti del Seminario Matematico della Università di Padova
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Antonio Iannizzotto (2012)
Annales Polonici Mathematici
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Applying a nonsmooth version of a three critical points theorem of Ricceri, we prove the existence of three periodic solutions for an ordinary differential inclusion depending on two parameters.
Radosław Pietkun (2010)
Bulletin of the Polish Academy of Sciences. Mathematics
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The existence of a continuous periodic and almost periodic solutions of the nonlinear integral inclusion is established by means of the generalized Schauder fixed point theorem.
Fabio Zanolin (1983)
Rendiconti del Seminario Matematico della Università di Padova
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S. Invernizzi, F. Zanolin (1979)
Rendiconti del Seminario Matematico della Università di Padova
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Bingwen Liu (2006)
Annales Polonici Mathematici
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We use the coincidence degree to establish new results on the existence and uniqueness of T-periodic solutions for a kind of Duffing equation with two deviating arguments of the form x'' + Cx'(t) + g₁(t,x(t-τ₁(t))) + g₂(t,x(t-τ₂(t))) = p(t).