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fix format in expectation.md
author
Tianyi Qiu
<gordanqiu@outlook.com>
Sat, 31 Oct 2020 04:52:42 +0000
(12:52 +0800)
committer
Tianyi Qiu
<gordanqiu@outlook.com>
Sat, 31 Oct 2020 05:44:48 +0000
(13:44 +0800)
docs/math/expectation.md
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diff --git
a/docs/math/expectation.md
b/docs/math/expectation.md
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--- a/
docs/math/expectation.md
+++ b/
docs/math/expectation.md
@@
-95,7
+95,7
@@
$$
我们称若干个随机变量 $X_{1\ldots n}$ **互相独立** ,当 $(X_1,\ldots,X_n)$ 取任意一组值的概率,等于每个 $X_i$ 分别取对应值的概率乘积。形式化地说:
$$
-P(\bigcap\limits_{i=1}^n X_i=F_i)=\prod\limits_{i=1}^n P(X_i=F_i),\forall F_{1\ldots n} \text{
s.t.
} F_i\in I(X_i)
+P(\bigcap\limits_{i=1}^n X_i=F_i)=\prod\limits_{i=1}^n P(X_i=F_i),\forall F_{1\ldots n} \text{
s.t.
} F_i\in I(X_i)
$$
由此可见,若干随机变量 **两两独立** 和 **互相独立** 是不同的概念。请注意这一点。