梁华老师的课程
第一节课简介R语言，只是简介而已，没有理论和问题工具还没有用武之地。
2.1 Sample space and event
Sample Space——可能结果的集合
Event, or random event
Complement of event
Union of events
Intersection of events
Difference of events
Partition of \omega
Indicator of A
Limits of a sequence of monotonic events
2.2 Probability
some axioms and property
2.3 Independence
Definition #乘积定义
Example 三局两胜，单局胜率0.6，两胜概率0.648
Q: How about 3 out of 5?
