From db79e164c914fabed88aa7e0739e20cd109f518f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=8B=A5=E5=A6=82=E6=84=8F?=
 <43609390+ruyiluo@users.noreply.github.com>
Date: Sun, 24 Jul 2022 10:41:22 +0800
Subject: [PATCH] Update itemcf.md
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Content-Type: text/plain; charset=UTF-8
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修正公式符号
---
 docs/ch02/ch2.1/ch2.1.1/itemcf.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/ch02/ch2.1/ch2.1.1/itemcf.md b/docs/ch02/ch2.1/ch2.1.1/itemcf.md
index 232055ea..aa800f37 100644
--- a/docs/ch02/ch2.1/ch2.1.1/itemcf.md
+++ b/docs/ch02/ch2.1/ch2.1.1/itemcf.md
@@ -33,7 +33,7 @@
    >
    >+ 下面计算物品 5 和物品 1 之间的余弦相似性:
    > $$
-   > \operatorname{sim}(\text { 物品1, 物品5 })=\operatorname{cosine}(\text { 物品1, 物品5 } )=\frac{9+20+12+1}{\operatorname{sqrt}(9+16+9+1)+\operatorname{sqrt}(9+25+16+1)}
+   > \operatorname{sim}(\text { 物品1, 物品5 })=\operatorname{cosine}(\text { 物品1, 物品5 } )=\frac{9+20+12+1}{\operatorname{sqrt}(9+16+9+1)*\operatorname{sqrt}(9+25+16+1)}
    > $$
    >
    >+ 皮尔逊相关系数类似。