By using the fixed point theory and a new three-solution theorems, the existence of multiple solutions of the boundary value problem was obtained.

通过利用不动点指数理论及一个新的三解定理，得到了边值问题多个正解的存在性。

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By using a fixed point theorem of mixed monotone operators in cone, this paper studied a fourth-order nonlinear singular boundary value problem, namely a class of elastic beam equation.

利用锥上的混合单调算子不动点定理，本文研究了一类四阶奇异非线性微分方程的边值问题，即一类弹性梁方程问题。

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In this paper, by using the fixed point index method, the authors discussed the periodic boundary value problem of first order differential systems.

摘要利用锥上的不动点指数研究了一阶非线性常微分方程组的周期边值问题。

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