利用压缩映照定理，研究了一个二阶泛函差分方程边值问题，得到存在和唯一性定理。

By using the contraction mapping principle, the boundary value problems for a second order functional difference equation are investigated.

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利用压缩映照定理，研究了一个二阶泛函差分方程边值问题，得到存在和唯一性定理。

By using the contraction mapping principle, the boundary value problems for a second order functional difference equation are investigated. Existence and uniqueness results are obtained.

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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。

The existence of periodic solution to nonlinear functional difference equation is considered by using the topological degree, and a periodic solution of this problem is obtained.

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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。

The existence of periodic solution to nonlinear functional difference equation is considered by using the topological degree, and a periodic solution of this problem is obtained.

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