From 4d816a894fbf5f37f133638580ecb2021e959f0d Mon Sep 17 00:00:00 2001 From: Wang Anjie Date: Wed, 7 Aug 2019 17:04:12 +0800 Subject: [PATCH] Update docs/math/permutation-group.md use \varnothing rather than \emptyset to represent an empty set Co-Authored-By: Shuhao Zhang <594422141@qq.com> --- docs/math/permutation-group.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/docs/math/permutation-group.md b/docs/math/permutation-group.md index 00e13169..d4740e99 100644 --- a/docs/math/permutation-group.md +++ b/docs/math/permutation-group.md @@ -6,7 +6,7 @@ author: Wajov ### 群的定义 -若集合 $S\neq\emptyset$ 和 $S$ 上的运算 $\cdot$ 构成的代数结构 $(S,\cdot)$ 满足以下性质: +若集合 $S\neq\varnothing$ 和 $S$ 上的运算 $\cdot$ 构成的代数结构 $(S,\cdot)$ 满足以下性质: - 封闭性: $\forall a,b\in S,a\cdot b\in S$ -- 2.11.0