By using the weak maximum principle, the uniqueness and stability of the solution of water vapour equation with the first, second and third boundary-value problems were proven.

利用该弱极大值原理，证明了对于第一类、第二类和第三类边值问题，水汽方程解的唯一性和稳定性。

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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。

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According to the principle, potential coefficients can be obtained directly in solving the mixed boundary value problems of first, second and third type.

根据这一原理可解第一、第二和第三边值问题的混合边值问题直接求得位系数。

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