Some new oscillation criteria are given for general nonlinear second-order ordinary differential equations with damping of the form x″+ p ( t ) x′+ q ( t ) f ( x ) = 0, where f is monotone or nonmonotone. Our results generalize and extend some earlier results of Deng.
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Published in Ukrains’kyi Matematychnyi Zhurnal, Vol. 60, No. 5, pp. 694–700, May, 2008.
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Çakmak, D. Oscillation criteria for nonlinear second-order differential equations with damping. Ukr Math J 60, 799–809 (2008). https://doi.org/10.1007/s11253-008-0088-6
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DOI: https://doi.org/10.1007/s11253-008-0088-6