Update cheatsheet.fr.md

12.temporary_ins/90.electromagnetism-in-vacuum/30.maxwell-electromagnetism-potentials/cheatsheet.fr.md

@@ -112,16 +112,21 @@ RÉSUMÉ
 
 --------------->
 
-$`div\,\overrightarrow{B} = 0\quad`$ (Maxwell-Flux)
+* $`div\,\overrightarrow{B} = 0\quad`$ (Maxwell-Thomson)   
+<br>
+$`\color{blue}{\scriptsize{\left.\begin{align} \quad\quad &\forall \overrightarrow{V}\,,\, 
+  div (\overrightarrow{rot}\,\overrightarrow{V}=0)\\
+  &div\,\overrightarrow{U}=0\end{align}\right\}\Longrightarrow\\
+  \exists\overrightarrow{V}\,,\, \overrightarrow{U}=\overrightarrow{rot}\,\overrightarrow{V}}}`$   
+<br>
+$`\exists\overrightarrow{A}\,,\, \overrightarrow{B}=\overrightarrow{rot}\,\overrightarrow{A}`$
+
+<!-------------
 
 $`\color{blue}{\scriptsize{\quad\quad 
     div\,\overrightarrow{U}=0\quad\Longleftrightarrow\quad\exists\overrightarrow{V}
-    \,,\, \overrightarrow{U}=\overrightarrow{rot}\,\overrightarrow{V}}}`$ 
-                     
-$`\exists\overrightarrow{A}
-    \,,\, \overrightarrow{B}=\overrightarrow{rot}\,\overrightarrow{A}}}`$
-
-<!-------------
+    \,,\, \overrightarrow{U}=\overrightarrow{rot}\,\overrightarrow{V}}}`$  
+    
  $`\color{blue}{\scriptsize{\left.\begin{align} \quad\quad &cos(a+b)=cos(a)cos(b)-sin(a)sin(b)\\
                      &cos(a-b)=cos(a)cos(b)+sin(a)sin(b)\end{align}
                \right\}\Longrightarrow\\