diff --git a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/05.classical-mechanics/vector-analysis/textbook.fr.md b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/05.classical-mechanics/vector-analysis/textbook.fr.md
index edbe650d0..50f33622b 100644
--- a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/05.classical-mechanics/vector-analysis/textbook.fr.md
+++ b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/05.classical-mechanics/vector-analysis/textbook.fr.md
@@ -298,11 +298,11 @@ $`\quad\Longrightarrow\quad ...`$
 
 $`\overrightarrow{U}`$ et $`\overrightarrow{V}`$ sont colinéaires 
 $`\;\Longrightarrow\left|\begin{array}{l}\overrightarrow{U}\cdot\overrightarrow{V}=+||\overrightarrow{U}||\cdot
-||\overrightarrow{V}||\,si\,\widehat{\overrightarrow{U},\overrightarrow{V}}=0 
+||\overrightarrow{V}||\text{si}\,\widehat{\overrightarrow{U},\overrightarrow{V}}=0 
 \\ \,
 \\
  \overrightarrow{U}\cdot\overrightarrow{V}=-||\overrightarrow{U}||\cdot||\overrightarrow{V}||
- \,si\, \widehat{\overrightarrow{U},\overrightarrow{V}}=\pi\end{array}\right.`$ 
+ \text{si}\, \widehat{\overrightarrow{U},\overrightarrow{V}}=\pi\end{array}\right.`$ 
  
  $`\overrightarrow{U}`$ et $`\overrightarrow{V}`$ sont colinéaires 
 $`\;\Longrightarrow\left|\overrightarrow{U}\cdot\overrightarrow{V}=+||\overrightarrow{U}||\cdot