第三边值问题 meaning in English

third boundary-value problem

We study in this paper the filtration problem in partially saturated layered porous media in one dimensional . that is the thid problem boundary value problem of on dimensional degenerate quasi - linear elliptic - parabolic equation with discontinuous coeffi - cients . the existence , uniquess of the solutions and some properties of the solution are proved
本文主要讨论一维有限双层多孔介质中部分饱和的渗流问题，即具有间断系数的一维拟线性椭圆-抛物退化方程的第三边值问题。证明了该问题的解的存在性、唯一性及弱解的边界性质。