摘要
运用逼近理论来讨论在Ｘ轴上退化的拟线性偏微分方程的混合边值问题，提出并证明了解的存在性。
By using an approximate theory, this paper studies mainly the mixed boun dary value problem for the second order quasilinear elliptic partial differential equation degenerated on a segment on the x axis. An existence theorem is proposed and proved.
