If you follow through from the independent theory, there's one of the basic relations in probability theory-- it's called the binomial distribution.

如果继续往下看,在概率论里有一个基本的概念,叫做二项分布

耶鲁公开课 - 金融市场课程节选

In the second lecture, I talked about the pooling of risks and the basic theme of that lecture was that we now have a mathematical theory, probability theory.

第二课，我讲了风险汇聚及分摊,那节课的主题是,一门数学理论，即概率论。

耶鲁公开课 - 金融市场课程节选