Merge pull request #282 from WAangzE/patch-1

Fix a mathematical environment issue.
Vonng · Feb 16, 2023 · 2ba635b · 2ba635b
2 parents f9c006a + 74eb54e
commit 2ba635b
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/ch2.md b/ch2.md
@@ -316,10 +316,12 @@ function getSharks() {
 ```
 
 在关系代数中：
+
 $$
-sharks = σ_{family = "sharks"}(animals)
+sharks = \sigma_{family = "sharks"}(animals)
 $$
-σ（希腊字母西格玛）是选择操作符，只返回符合条件的动物，`family="shark"`。
+
+$\sigma$（希腊字母西格玛）是选择操作符，只返回符合条件的动物，`family="shark"`。
 
 定义 SQL 时，它紧密地遵循关系代数的结构：