摘要
随机变量的分布函数是概率论中的重要概念。文章就分布函数的两种定义法进行了分析和比较，初步得出了两种定义间的差异和联系。
The distributing function of random variable is an important concept in the theory of ratio. This thesis analyzes and compares the two defining methods of it and finds out the differences and similarities of them.
关键词
分布函数
定义方法
差异
联系
Distribution Function
Defining Method
Differences
Similarities.
