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.
展开▼
