修改几个符号错误

fengdu78 · Sep 24, 2019 · e6879b2 · e6879b2
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diff --git a/0.math/1.CS229/2.CS229-Prob.pdf b/0.math/1.CS229/2.CS229-Prob.pdf
diff --git a/0.math/1.CS229/markdown/2.CS229-Prob.md b/0.math/1.CS229/markdown/2.CS229-Prob.md
@@ -30,7 +30,7 @@
 
   (2) $A \in \mathcal{F} \Longrightarrow \Omega \backslash A \in \mathcal{F}$
 
-  (3) $A_1,A_2,\cdots \cup_{i} A_{i} \in \mathcal{F}\Longrightarrow\cup_{i} A_{i} \in \mathcal{F}$
+  (3) $A_1,A_2,\cdots A_{i} \in \mathcal{F}\Longrightarrow\cup_{i} A_{i} \in \mathcal{F}$
 
 -  概率度量$P$：函数$P$是一个$  \mathcal{F} \rightarrow \mathbb{R}$的映射，满足以下性质：
   - 对于每个 $A \in \mathcal{F}$，$P(A) \geq 0$,