From ce64616efd769c43d1329bc7107f8a96d087d022 Mon Sep 17 00:00:00 2001
From: Claude Meny <claude.meny@irap.omp.eu>
Date: Sun, 30 Aug 2020 10:32:27 +0200
Subject: [PATCH] Update textbook.fr.md

---
 .../04.reference-frames-coordinate-systems/textbook.fr.md     | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/04.reference-frames-coordinate-systems/textbook.fr.md b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/04.reference-frames-coordinate-systems/textbook.fr.md
index f3648d231..0e045f4db 100644
--- a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/04.reference-frames-coordinate-systems/textbook.fr.md
+++ b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/04.reference-frames-coordinate-systems/textbook.fr.md
@@ -289,11 +289,11 @@ of a sheet of paper. (to be submitted to mathematicians). <br>
 [ES] Cálculo integral del área $`A`$ de una superficie cerrada macroscópica $`S_{\circ}`$ :<br>
 [FR] Calcul intégral de l'aire $`A`$ d'une surface fermée $`S_{\circ}`$ macroscopique :<br>
 [EN] Integral calculus of the area $`A`$ of a macroscopic closed surface $`S_{\circ}`$ :<br>
-$`A=\displaystyle\ooint_{S_{\bigcirc}} dA`$<br>
+$`A=\displaystyle\oiint_{S_{\bigcirc}} dA`$<br>
 [ES] Cálculo integral del área $`A`$ de una superficie abierta macroscópica $`S_{\smallsmile}`$ :<br>
 [FR] Calcul intégral de l'aire $`A`$ d'une surface ouverte $`S_{\smallsmile}`$ macroscopique :<br>
 [EN] Integral calculus of the area $`A`$ of a macroscopic open surface $`A_{\smallsmile}`$ :<br>
-$`A=\displaystyle\int_{S_{\smallsmile}} dA`$<br>
+$`A=\displaystyle\iint_{S_{\smallsmile}} dA`$<br>