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《微分方程年刊(英文版)》 2012-01
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MULTIPLE PERIODIC SOLUTIONS TO SECOND ORDER FUNCTIONAL DIFFERENTIAL EQUATION WITH INFINITE DELAY

Lili Gao (Dept.of Math.and Physics,Bengbu College,Bengbu 233000,Anhui) Lianglong Wang (School of Math.and Computing Science,Anhui University,Hefei 230039)  
This paper is concerned with the existence of positive periodic solutions to a second order functional differential equation with infinite delay.Under the appropriate conditions,some existence and multiplicity of positive periodic solutions are derived by an abstract fixed-point theorem.
【Fund】: Supported by the Natural Science Foundation of Anhui Province Education Department (KJ2009A49);; the Natural Science Foundation of Bengbu College (2010ZR04)
【CateGory Index】: O175
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