二元凸函数的等价性定义及其判别法

The Equivalent Definitions and Decision Methods of Two-variable Convex Function

给出二元凸函数的一个定义，由此导出了关于二元凸函数的几个等价定义，并得到了几个有用的判别法．

On the basis of the definition of two- variable convex function, it is proved that several equivalent definition are similar to those of one-variable convex function. Moreover several usefuldecision methods are presented.