Update textbook.en.md

6 years ago · da1f043e0d
1 changed files with 3 additions and 1 deletions
--- a/light/01.electromagnetic-spectrum/01.new-course-main/textbook.en.md
+++ b/light/01.electromagnetic-spectrum/01.new-course-main/textbook.en.md
@ -1,5 +1,7 @@
 ---
 title: 'new course : main'
+published: no
 ---

-new course : main
+test :
+$`\oiint \vec{B} \cdot \vec{dS}