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zh-cn/set-theory-cn.html.markdown
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@ -8,7 +8,6 @@ lang: zh-cn
---
集合论是数学的一个分支，研究集合、它们的运算和它们的性质。
* 集合由不重复的项组成。
## 基本符号
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* 子集限定词，`⊆`，表示“是……的子集”;
* 真子集限定词，`⊂`，表示“是……的真子集”。
### 重要的集合
* `∅`，空集，即不包含任何元素的集合；
* `ℕ`，自然数集；