一阶非线性椭圆型方程组的斜微商问题解的稳定性（Ⅰ）

The Stability of Solution of the Oblique Derivative Problem for the Nonlinear Elliptic System of First Order EquationsPart(I)

讨论了一阶非线性椭圆型方程组斜微商问题解的稳定性，这个结果是借助于有关边值问题解的先验估计而导出的。在（Ⅰ）这部分，主要是给出问题的提法与条件，以及等价性定理和边值问题解的表示式。

This paper discusses the stability of solution of the oblique derivative problem for the nonlinear elliptic system of first order equations. This result is derived with the help of a priori estimation of solution for relative boundary value problem. The main purpose of this part(I) is to give the formulation and conditions of the problem, the equivalence theorem and the expression of solution of the boundary value problem.