Update textbook.en.md

6 years ago · d54c41e9c0
1 changed files with 1 additions and 2 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
@ -4,6 +4,5 @@ published: no
 ---

 test :
-$`\oiint_S \vec{B} \cdot \vec{dS}`$
+$`\oiint_S \vec{B} \cdot \vec{dS}=0`$

-$`\Long\oiint_S \vec{B} \cdot \vec{dS}`$