diff --git a/slides/chapter-09.de.md b/slides/chapter-09.de.md
index 1b72247..2b641e1 100644
--- a/slides/chapter-09.de.md
+++ b/slides/chapter-09.de.md
@@ -50,7 +50,7 @@ Einige Beispiele
     <td>$e^{\pi}$</td>
   </tr>
   <tr class="fragment">
-    <td>`\sum_{i=1}\^{n}x^2`</td>
+    <td>`\sum_{i=1}^{n}x^2`</td>
     <td>$\sum_{i=1}^{n} x^2$</td>
   </tr>
   <tr class="fragment">
diff --git a/slides/chapter-09.en.md b/slides/chapter-09.en.md
index 1456986..81aa0e9 100644
--- a/slides/chapter-09.en.md
+++ b/slides/chapter-09.en.md
@@ -52,7 +52,7 @@ Examples
     <td>$e^{\pi}$</td>
   </tr>
   <tr class="fragment">
-    <td>`\sum_{i=1}\^{n}x^2`</td>
+    <td>`\sum_{i=1}^{n}x^2`</td>
     <td>$\sum_{i=1}^{n} x^2$</td>
   </tr>
   <tr class="fragment">