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《Journal of Hunan City University(Natural Science)》 2006-04
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Periodic Solution for a Class of Duffing Equations with Delay

ZHU Huan-tao1,LUO Zhi-guo2(1.Hunan College of Information,Changsha 410200,China;2.Mathematics and Computer Science School,Hunan Normal University,Changsha 410081,China)  
In this paper,the duffing equation ax ′′(t) + f(x(t)) x ′(t) + bx(t) + g(x(t-τ(t))) = p(t)is considered,using the theory of coincidence degree,the sufficient condition for its there being at least a 2 π-periodic solution is obtained.
【CateGory Index】: O175.1
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