We consider the periodic solutions of the Hamiltonian system - x(two over dots) = V' (X) with V being superquadratic in some directions at infinity. Some theorems on periodic solutions for superquadratic V are generalized. (c) 2005 Elsevier Ltd. All rights reserved.
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Huanggang Normal Univ, Dept Math, Huanggang 438000, Hubei, Peoples R ChinaHuanggang Normal Univ, Dept Math, Huanggang 438000, Hubei, Peoples R China
Jiang, Qin
Ma, Sheng
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Huanggang Normal Univ, Dept Math, Huanggang 438000, Hubei, Peoples R ChinaHuanggang Normal Univ, Dept Math, Huanggang 438000, Hubei, Peoples R China
Ma, Sheng
Hu, Zhihua
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Huanggang Normal Univ, Dept Math, Huanggang 438000, Hubei, Peoples R ChinaHuanggang Normal Univ, Dept Math, Huanggang 438000, Hubei, Peoples R China
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Southwest Univ, Sch Math & Stat, Chongqing 400715, Peoples R ChinaSouthwest Univ, Sch Math & Stat, Chongqing 400715, Peoples R China
Ke, Xiao-Feng
Liao, Jia-Feng
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China West Normal Univ, Coll Math Educ, Nanchong 637002, Sichuan, Peoples R ChinaSouthwest Univ, Sch Math & Stat, Chongqing 400715, Peoples R China