EXISTENCE OF PERIODIC SOLUTIONS WITH PRESCRIBED MINIMAL PERIOD FOR A FOURTH ORDER NONLINEAR DIFFERENCE SYSTEM

다국어 초록 (Multilingual Abstract)

In this article, we consider a fourth order nonlinear dierence system. By making use of the critical point theory, we obtain some new existence theorems of at least one periodic solution with minimal period.
Our main approach used in this article is the variational technique and the Saddle Point Theorem.

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