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2005

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Existence of positive periodic solutions to nonlinear second order differential equations

13 years 11 months ago

In this paper, we discuss the existence of positive periodic solutions to the nonlinear differential equation u (t) + a(t)u(t) = f (t, u(t)), t R, where a : R [0, +) is an -peri...

Fuyi Li, Zhanping Liang

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