diff --git a/01.curriculum/01.physics-chemistry-biology/03.niv3/01.nature-light/01.electromagnetic-spectrum/01.new-course-main/textbook.en.md b/01.curriculum/01.physics-chemistry-biology/03.niv3/01.nature-light/01.electromagnetic-spectrum/01.new-course-main/textbook.en.md
deleted file mode 100644
index 6aff3b811..000000000
--- a/01.curriculum/01.physics-chemistry-biology/03.niv3/01.nature-light/01.electromagnetic-spectrum/01.new-course-main/textbook.en.md
+++ /dev/null
@@ -1,8 +0,0 @@
----
-title: 'new course : main'
-published: no
----
-
-test :
-$`\oiint_S \vec{B} \cdot \vec{dS}=0`$
-