Update Chapter 1.md

public/notes/stat/STAT 5005/Chapter 1.md

@@ -126,7 +126,7 @@
 
 ### 1.2 $\sigma(\mathcal A)$ & Borel $\sigma$-field
 
-- **Definition**. Let $\mathcal A$ be a collection of subsets of $\Omega$, then define $\sigma$-field as $\sigma(\mathcal A):=\underset{\mathcal A\subset\mathcal F_i,\mathcal F_i\text{ is $\sigma$-field for all }i\in I}\cap \mathcal F_i$. 
+- **Definition**. Let $\mathcal A$ be a collection of subsets of $\Omega$, then define $\sigma$-field as $\sigma(\mathcal A):=\underset{\mathcal A\subset\mathcal F_i,\mathcal F_i\text{ is} \sigma\text{-field for all }i\in I}\cap \mathcal F_i$. 
 
   - Simply put it, $\sigma(\mathcal A)$ is smallest $\sigma$-algebra containing $\mathcal A$
   - We also call $\sigma(\mathcal A)$ as $\sigma$-algebra generated by $\mathcal A$