MULTIPLE PERIODIC SOLUTIONS TO SECOND ORDER FUNCTIONAL DIFFERENTIAL EQUATION WITH INFINITE DELAY

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Lili Gao Deptof Mathand PhysicsBengbu CollegeBengbu Anhui Lianglong Wang School of Mathand Computing ScienceAnhui UniversityHefei [233000 ,230039 ]
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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.
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