The existence of periodic solution to nonlinear functional differenceequation is considered by using the topological degree, and a periodic solutionof this problem is obtained.
利用拓扑度理论对一类非线性泛函差分方程周期解的存在性进行了讨论，得到该问题周期解的一个存在定理。
2
By using fixed point theorem and constructing almost periodic sequence solution for differenceequation, the authors get the sufficient conditions for the existence of the almost periodic solution.
利用不动点方法及对差分方程构造概周期解，获得了概周期解存在的充分条件。
3
A kind of ordinary differenceequation that can be transferred to Euler equation, often appears in polar coordinates solutionof elastic problems.