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Multiple periodic solutions for non-linear difference systems involving the $$p$$-Laplacian. (English) Zbl 1274.39009
Summary: Using the three critical points theorem, Clark’s theorem and the Morse theory, multiple periodic solutions for non-linear difference systems involving the $$p$$-Laplacian are obtained by variational methods.

##### MSC:
 39A10 Additive difference equations 39A23 Periodic solutions of difference equations 58E05 Abstract critical point theory (Morse theory, Lyusternik-Shnirel’man theory, etc.) in infinite-dimensional spaces
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##### References:
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