关于一个数学期望命题及其推论的证明

About a Mathematical Expectation Proposition and Proof of Its Inference

文中利用了实变函数中的一些基本思想,证明了一个几乎处处为零的随机变量,它的数学期望一定存在,且期望值就是零,并在此基础上给出了它的两个推论.

This paper proves an almost everywhere for 0 random variables with some basic ideas of real variable function, its mathematical expectation must exist, and the expectation value is O, and based on this, presents two inferences.