二阶椭圆方程的解的凸性研究

二阶椭圆方程的解的几何性质是偏微分方程研究中的一个经典主题,其中凸性的研究是重要组成部分.讨论了处理二阶椭圆方程解的凸性的若干方法,并结合具体实例,对这些方法的应用进行了比较.;The geometrical property of the solutions of the second order elliptic is a classical topic in the research of the partial differential equation.Some methods of dealing with the convexity of the solutions of the second order elliptic equations are introduced, discussing their application by taking advantage of examples