Journal of the London Mathematical Society 2000 61(3):774-788; doi:10.1112/S002461070000870X
© 2000 by London Mathematical Society
© The London Mathematical Society
The Existence and Multiplicity of Periodic Solutions for Duffing's Equation ü+g(u) = s+h(t)
Wang Zaihong
Department of Mathematics, Capital Normal University Beijing 100037, China, WangZh{at}mail.cnu.edu.cn
Received 16 September 1997.
The paper proves the existence and multiplicity of periodic solutions of the equation
ü+g(u) = s+h(t,)
where g:R
R is of class C1, h:R
R is continuous and 2
-periodic, and s is a parameter.

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