diff --git a/pages/Math4111/Math4111_L22.md b/pages/Math4111/Math4111_L22.md
index 5986481..8ee3f28 100644
--- a/pages/Math4111/Math4111_L22.md
+++ b/pages/Math4111/Math4111_L22.md
@@ -71,9 +71,7 @@ $$
 >
 > $I(9)=\{1,2,\dots,9\}$, $J(9)=\{1,2,4,3,6,8,5,10,12\}$, $I(9)\backslash J(9)=\{7,9\}$, $J(9)\backslash I(9)=\{10,12\}$.
 >
->$$
-|s_9 - t_9| \leq |a_7|+|a_9|+|a_{10}|+|a_{12}| \leq \sum_{k=7}^{12} |a_k| < \epsilon
-$$
+>$$ |s_9 - t_9| \leq |a_7|+|a_9|+|a_{10}|+|a_{12}| \leq \sum_{k=7}^{12} |a_k| < \epsilon $$
 
 This proves that $\lim_{n\to\infty} |s_n - t_n| = 0$.