Periodic solutions of equations with osc
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A.M. Krasnosel'skii; J. Mawhin
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Article
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2000
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Elsevier Science
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English
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## In this paper, we consider the Sn-periodic problem for the equation where n is a positive integer, b(t) is continuous and Pn-periodic, and f(x) is bounded and continuous. We give a new formulation for the Lazer-Leach conditions for the existence of 2a-periodic solutions, and new sufficient con