updates

content/Math4111/Math4111_L3.md

@@ -26,7 +26,8 @@ Let $S=\mathbb{Z}$.
 
 Proof that $LUBP\implies GLBP$.
 
-Proof:
+<details>
+<summary>Proof</summary>
 
 Let $S$ be an ordered set with LUBP. Let $B<S$ be non-empty and bounded below.
 
@@ -57,7 +58,7 @@ Let's say $\alpha=sup\ L$. We claim that $\alpha=inf\ B$. We need to show $2$ th
 
 Thus $\alpha=inf\ B$
 
-QED
+</details>
 
 ### Field