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《ACTA MATHEMATICA SINICA》 2000-04
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2π-Periodic Solutions to Ordinary Differential Systems at Resonance

HAN Zhi-qing (Institute of Mathematicol Sciences, Dalian University of Technology, Dalian 116024, P. R. China) (E-mail: hanzhiq@dlut.edu.cn)  
In this paper, we obtain two existence results for 2π-periodic solutions of the following sublinear ordinary differential equations at resonance: u(t) + m2u(t)+ G(t, u(t)) =0 under coercive conditions on G(t, u) by critical point theorem.
【Fund】: 国家自然科学基金!19871009
【CateGory Index】: O175.12
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