diff --git a/12.temporary_ins/06.geometry-coordinates/40.n4/10.main/textbook.fr.md b/12.temporary_ins/06.geometry-coordinates/40.n4/10.main/textbook.fr.md
index 99690ede5..882d35beb 100644
--- a/12.temporary_ins/06.geometry-coordinates/40.n4/10.main/textbook.fr.md
+++ b/12.temporary_ins/06.geometry-coordinates/40.n4/10.main/textbook.fr.md
@@ -140,7 +140,7 @@ les $`n`$ fonctions $`x_i(x'_i)`$ :
 $`\quad\begin{matrix}
 x_1(x'_1, x'_2, ... , x'_n) \\
 x_2(x'_1, x'_2, ... , x'_n) \\
-... \\
+\vdots \\
 x_n(x'_1, x'_2, ... , x'_n) 
 \end{matrix}`$