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Periodic solutions of a discrete Hamiltonian system with a change of sign in the potential. (English) Zbl 1106.39022
The authors consider a general setting for a discrete second-order Hamiltonian system for which they study existence of nontrivial subharmonic solutions. Their main result is also illustrated on a difference equation. The followed approach is the critical point theory.

##### MSC:
 39A12 Discrete version of topics in analysis 39A11 Stability of difference equations (MSC2000) 37J45 Periodic, homoclinic and heteroclinic orbits; variational methods, degree-theoretic methods (MSC2010)
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##### References:
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