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Sign-changing solutions to discrete fourth-order Neumann boundary value problemsDOI: 10.1186/1687-1847-2013-10 Keywords: topological degree theory, fixed point index theory, sign-changing solutions, positive solutions, negative solutions Abstract: By using topological degree theory and fixed point index theory, we consider a discrete fourth-order Neumann boundary value problem. We provide sufficient conditions for the existence of sign-changing solutions, positive solutions, and negative solutions.
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