Update textbook.en.md

6 years ago · a62a58c11c
1 changed files with 1 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
@ -6,4 +6,4 @@ published: no
 test :
 $`\oiint_S \vec{B} \cdot \vec{dS}`$

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