diff --git a/10.brainstorming-innovative-courses/intercambio-curso-electromagnetismo/textbook.en.md b/10.brainstorming-innovative-courses/intercambio-curso-electromagnetismo/textbook.en.md
index 53e931b64..8e82dd014 100644
--- a/10.brainstorming-innovative-courses/intercambio-curso-electromagnetismo/textbook.en.md
+++ b/10.brainstorming-innovative-courses/intercambio-curso-electromagnetismo/textbook.en.md
@@ -192,12 +192,12 @@ ES : operador nabla   <br>
 FR : opérateur nabla   <br>
 EN : nabla operator
 
-$`\vec{grad\;f}=\nabla\;f`$, $`\vec{\nabla\;f`}`$ better, no?   <br>
+$`\overrightarrow{grad}\;f=\nabla\;f`$, $`\overrightarrow{\nabla}\;f``$ better, no?   <br>
 ES : gradiente   <br>
 FR : gradient   <br>
 EN : gradient
 
-$`div \vec{U}`= \nabla \cdot \vec{U}`$ , $`div \vec{U}`= \vec{\nabla} \cdot \vec{U}`$    <br>
+$`div \vec{U}= \nabla \cdot \vec{U}`$ , $`div \vec{U}= \vec{\nabla} \cdot \vec{U}`$    <br>
 ES : divergencia   <br>
 FR : divergence   <br>
 EN : divergence   <br>