针对一类特殊的二阶差分方程,并且在合适的条件下,利用临界点理论,先引进适当的变分框架,再结合环绕方法,证明了这一类二阶差分方程至少一个周期解的存在性,推广了前人的结果.%Under suitable conditions with critical theory and linking methods, the paper proves that at least one periodic solution of a kind of second order difference equations exists. The research generalizes works done by the predecessors.
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