Update textbook.en.md

5 years ago · 398d4f09d8
1 changed files with 5 additions and 1 deletions
--- a/12.temporary_ins/05.coordinates-systems/30.cylindrical-coordinates/10.main/textbook.en.md
+++ b/12.temporary_ins/05.coordinates-systems/30.cylindrical-coordinates/10.main/textbook.en.md
@ -8,9 +8,13 @@ lessons:
      order:
    - slug: cylindrical-coordinates-linear
      order: 1
+---
+
+<!--
    - slug: es-en-cylindrical-coordinates-exchange
      order: 3
---
+-->
+
 <!--caligraphie de l'intégrale double curviligne-->
 $`\def\oiint{\displaystyle\mathop{{\iint}\mkern-18mu \scriptsize \bigcirc}}`$
 $`\def\Ltau{\Large{\tau}\normalsize}`$