From 4d1d236e4ccf4f8a4301a6abbda88d661daf2fae Mon Sep 17 00:00:00 2001
From: Claude Meny <claude.meny@irap.omp.eu>
Date: Wed, 9 Jun 2021 12:29:18 +0200
Subject: [PATCH] Update textbook.fr.md

---
 .../40.classical-mechanics/10.main/textbook.fr.md             | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/40.classical-mechanics/10.main/textbook.fr.md b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/40.classical-mechanics/10.main/textbook.fr.md
index 58c46a6a7..280e0f604 100644
--- a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/40.classical-mechanics/10.main/textbook.fr.md
+++ b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/40.classical-mechanics/10.main/textbook.fr.md
@@ -254,12 +254,12 @@ remember to replace (auto-tra) with your initials (YYY).
 [EN] Galileo's transformations
 
 $`\mathbf{
-\left\{\begin{matrix}
+\left\{\begin{array}{r}
 t'=t \\
 x'=x-V_x\,t \\
 y'=y-V_y\,t \\   
 z'=z-V_z\,t 
-\end{matrix}
+\end{array}
 \right.
 }`$