Fixed sign solutions of second-order dif
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A. Cabada; V. Otero-Espinar
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Article
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2003
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Elsevier Science
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English
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In this paper, we study the existence of solution of the nonlinear second-order difference problem with Neumann boundary conditions. Assuming the existence of a pair of ordered lower and upper solutions y and p, we obtain optimal existence results for the case y < p and even for y 2 p. To this end,