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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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
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Chongqing Technol & Business Univ, Coll Math & Stat, Chongqing, Peoples R ChinaChongqing Technol & Business Univ, Coll Math & Stat, Chongqing, Peoples R China
Deng, Yiyang
Li, Fengying
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Southwestern Univ Finance & Econ, Sch Econ & Math, Chengdu 611130, Sichuan, Peoples R ChinaChongqing Technol & Business Univ, Coll Math & Stat, Chongqing, Peoples R China
Li, Fengying
Li, Bingyu
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Chengdu Univ Technol, Coll Informat Sci & Technol, Chengdu, Sichuan, Peoples R ChinaChongqing Technol & Business Univ, Coll Math & Stat, Chongqing, Peoples R China
Li, Bingyu
Lv, Ying
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Southwest Univ, Dept Math & Stat, Chongqing, Peoples R ChinaChongqing Technol & Business Univ, Coll Math & Stat, Chongqing, Peoples R China