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中文摘要：
利用极值原理和上下解方法给出了具有Sturm-Liouville边界条件的四阶奇异微分方程C^2[0,1]和C^3[0,1]正解的存在性,允许非线性项f（t,u）在u=0和t=0,1处可以是奇异的。
英文摘要：
A class of fourth order singular differential equations with Sturm-Liouville boundary conditions is investigated by the extremum principle and the upper and lower solution method.The nonlinear term f（t,u）can be singular at u=0 and t=0,1.
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