Update textbook.en.md

03335613 · Claude Meny · bd675268 · 03335613
Commit 03335613 authored Sep 08, 2020 by Claude Meny
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textbook.en.md ...m-versus-optical-system/01.new-course-main/textbook.en.md +3 -1

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--- a/01.curriculum/01.physics-chemistry-biology/03.Niv3/02.Geometrical-optics/05.paraxial-optics/03.physical-system-versus-optical-system/01.new-course-main/textbook.en.md
+++ b/01.curriculum/01.physics-chemistry-biology/03.Niv3/02.Geometrical-optics/05.paraxial-optics/03.physical-system-versus-optical-system/01.new-course-main/textbook.en.md
 ---
-title: 'new course : main'
+title: 'new course : main
+published: false
+visible: false
 ---
 new course : main
\ No newline at end of file