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摘要: 利用Z2型山路定理,获得关于形如ü(t)+k2ω2u+▽F(t,u(t))=0(a.e.t∈[0,T])的超二次共振非自治二阶系统,当无界时,多重周期解存在性的定理.Abstract: The existence and multiplicity of periodic solutions are obtained for a class of su-perquadratic resonance nonautonomous second order systems ü(t)+k2ω2u+▽F(t, u(t)) = 0, a.e.t ∈ [0,T] by Z2 version of the Mountain Pass Theorem on the condition that is unbounded.
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