diff --git a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/42.relativistic-mechanics/30.n3/10.main/textbook.fr.md b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/42.relativistic-mechanics/30.n3/10.main/textbook.fr.md
index b0a52eeb4..140d85c6c 100644
--- a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/42.relativistic-mechanics/30.n3/10.main/textbook.fr.md
+++ b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/42.relativistic-mechanics/30.n3/10.main/textbook.fr.md
@@ -372,7 +372,7 @@ y'=y\\
 z'=z 
 \end{array}\right.`$
 
-avec $`\gamma=\dfrac{1}{\sqrt{1-\dfrac{V^2}{c^2}}}`$
+avec $`\gamma=\dfrac{1}{\sqrt{1-\dfrac{V^2}{c^2}}}=\left(1-\dfrac{V^2}{c^2}\right)^{-1/2}`$
 
 
 <!---------------------------
@@ -396,6 +396,7 @@ $`\quad\overrightarrow{e_x'}=\overrightarrow{e_x}\;\;,\;\;\overrightarrow{e_y'}=
 
 ------------------------------------>
 
+--------------------------------------------------------------
 
 *CLAPTMEC-FU-070* :   
 [ES] teorema de la suma de velocidades