In this paper we discussed the existence and uniqueness theorems for third-order boundary value problems, using the method of upper and lower solutions.
本文利用上、下解方法证明了两类三阶边值问题解的存在性和唯一性。
We show existence results for multiple sign-changing solution for third-order two- point boundary value problems by using the fixed point index and the topologic degree theory.
主要研究一类三阶两点边值问题变号解的存在性和多重性，利用不动点指数和拓扑度理论等得到了新的结论。
In this paper the "cover layer" phenomenon of solution for a class of singularly perturbed boundary value problems of third order semilinear equation is revealed.
本文揭示了一类三阶半线性方程奇摄动边值问题解的“套层”现象。
应用推荐