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Update docs/math/expectation.md
author
TianyiQ
<34389237+TianyiQ@users.noreply.github.com>
Sat, 31 Oct 2020 05:27:38 +0000
(13:27 +0800)
committer
GitHub
<noreply@github.com>
Sat, 31 Oct 2020 05:27:38 +0000
(13:27 +0800)
Co-authored-by: mgt <mgt@oi-wiki.org>
docs/math/expectation.md
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a/docs/math/expectation.md
b/docs/math/expectation.md
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--- a/
docs/math/expectation.md
+++ b/
docs/math/expectation.md
@@
-81,7
+81,7
@@
我们称若干个事件 $A_{1\ldots n}$ **互相独立** ,当对于其中任何一个子集,该子集中的事件同时发生的概率,等于其中每个事件发生概率的乘积。形式化地说:
$$
-P
(\bigcap\limits_{E\in T} E
)=\prod_{E\in T} P(E), \forall T\subseteq \{A_1,A_2,\ldots,A_n\}
+P
\Big(\bigcap\limits_{E\in T} E\Big
)=\prod_{E\in T} P(E), \forall T\subseteq \{A_1,A_2,\ldots,A_n\}
$$
由此可见,若干事件 **两两独立** 和 **互相独立** 是不同的概念。请注意这一点。