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Update docs/math/permutation-group.md
author
Wang Anjie
<waj19971112@qq.com>
Wed, 7 Aug 2019 09:04:12 +0000
(17:04 +0800)
committer
GitHub
<noreply@github.com>
Wed, 7 Aug 2019 09:04:12 +0000
(17:04 +0800)
use \varnothing rather than \emptyset to represent an empty set
Co-Authored-By: Shuhao Zhang <594422141@qq.com>
docs/math/permutation-group.md
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b/docs/math/permutation-group.md
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docs/math/permutation-group.md
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docs/math/permutation-group.md
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-6,7
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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: $\forall a,b\in S,a\cdot b\in S$