update notations and fix typos

pages/Math4111/Exam_reviews/Math4111_E2.md

@@ -22,7 +22,7 @@ Suppose $S$ and $T$ are compact, let $\{G_\alpha\}_{\alpha\in A}$ be an open cov
 
 ...
 
-EOP
+QED
 
 ## K-cells are compact
 
@@ -63,7 +63,7 @@ Let $n\in \mathbb{N}$ be such that $\frac{1}{2^n}<r$. Then by $(c)$, $I(n)\subse
 
 Then $\{G_{\alpha_0}\}$ is a cover of $I_n$ which contradicts with (b)
 
-EOP
+QED
 
 ## Redundant subcover question