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中文摘要：
利用混合单调算子，给出了奇异二阶差分方程边值问题{△^2y（i-1）＋λf（i,y（i））=0,i∈N={1,2…,T},λ＞0 y（0）=y（T＋1）=0（基中f（i,y）∈C（N×[0,∞）,[0,∞））,非线性项f在y=0可能是奇异的）的解的存在及唯一性．
英文摘要：
By means of a fixed point theorem, existence and uniqueness are established for singular boundary value problems for second order difference equations. The theorems obtained are very general and complement previous known results.
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