In this paper ,we consider the existence of positive solutions for a class of nonlinear boundary-value problem of fractional differential equations with integral boundary conditions .Our analysis relies on known Guo-Krasnoselskii fixed point theorem .%利用Guo/Krasnoselskii不动点定理研究一类具有积分边界条件的非线性分数阶微分方程边值问题正解的存在性。
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