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Homoclinic orbits for nonlinear difference equations containing both advance and retardation. (English) Zbl 1160.39311
Summary: We discuss how to use the critical point theory to study the existence of a nontrivial homoclinic orbit for nonlinear difference equations containing both advance and retardation without any periodic assumptions. Moreover, if the nonlinearity is an odd function, the existence of an unbounded sequence of homoclinic orbits is obtained.

MSC:
 39A11 Stability of difference equations (MSC2000)
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References:
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