diff --git a/16多重积分.tex b/16多重积分.tex
index b926638..796eef2 100644
--- a/16多重积分.tex
+++ b/16多重积分.tex
@@ -135,7 +135,7 @@
 \end{definition}
 
 \begin{definition}[零面积集]
-    若$E \subset \realnum^2$满足：对任意的$\varepsilon > 0$，存在有限个闭矩形$\{D_i\}_{i = 1}^m$，使得$E \subset \bigcup \limits_{i = 1}^m D_i$且$\sum_{i = 1}^m \sigma(D_i) < \varepsilon$，则称$E$为二维零测集。
+    若$E \subset \realnum^2$满足：对任意的$\varepsilon > 0$，存在有限个闭矩形$\{D_i\}_{i = 1}^m$，使得$E \subset \bigcup \limits_{i = 1}^m D_i$且$\sum_{i = 1}^m \sigma(D_i) < \varepsilon$，则称$E$为二维零面积集。
 \end{definition}
 
 \begin{corollary}