Update textbook.en.md

398d4f09 · Claude Meny · 34c291da · 398d4f09
Commit 398d4f09 authored Jan 29, 2021 by Claude Meny
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textbook.en.md ...systems/30.cylindrical-coordinates/10.main/textbook.en.md +5 -1

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--- 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-->
 $`\def\oiint{\displaystyle\mathop{{\iint}\mkern-18mu \scriptsize \bigcirc}}`$
 $`\def\Ltau{\Large{\tau}\normalsize}`$