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Update 第一章_数学基础.md

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ch01_数学基础/第一章_数学基础.md
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@ -292,7 +292,7 @@ PMF 可以同时作用于多个随机变量，即联合概率分布(joint probab
如果一个函数$P​$是随机变量 $X​$ 的 PMF， 那么它必须满足如下三个条件
- $P​$的定义域必须是的所有可能状态的集合
- $P​$的定义域必须是x的所有可能状态的集合
- $∀x∈​$x, $0 \leq P(x) \leq 1 ​$.
- $∑_{x∈X} P(x)=1$. 我们把这一条性质称之为 归一化的(normalized)