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Existence of positive solutions for a kind of periodic boundary value problem at resonanceDOI: 10.1186/1687-2770-2013-19 Keywords: periodic boundary value problem, positive solution, coincidence equation Abstract: In the paper we provide sufficient conditions for the existence of positive solutions for some second-order differential equation subject to periodic boundary conditions. Our method employs a Leggett-Williams norm-type theorem for coincidences due to O’Regan and Zima. Two examples are given to illustrate the main result of the paper.
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