Update cheatsheet.fr.md

12.temporary_ins/90.electromagnetism-in-vacuum/10.maxwell-equations/20.overview/cheatsheet.fr.md

@@ -121,24 +121,22 @@ $`\Longrightarrow`$
 **$`\mathbf{\displaystyle \quad\oiint_{S\leftrightarrow\Ltau} \overrightarrow{E}\cdot\overrightarrow{dS}
 = \dfrac{1}{\epsilon_0} \cdot \iiint_{\Ltau} \rho \cdot d\tau = \dfrac{Q_{int}}{\epsilon_0}}`$**
 
-   * $`\left.\begin{array}{l}
-\displaystyle\iiint_{\Ltau} div \overrightarrow{E}\,d\tau = \iiint_{\Ltau}\dfrac{\dens}{\epsilon_0}\,d\tau \\
-\displaystyle\iiint_{\Ltau} div\;\overrightarrow{E} \cdot d\tau = \displaystyle 
-\oiint_{S\leftrightarrow\Ltau} \overrightarrow{E}\cdot\overrightarrow{dS}
-\end{array}\right\}`$
-$`\Longrightarrow`$
-**$`\mathbf{\displaystyle \quad\oiint_{S\leftrightarrow\Ltau} \overrightarrow{E}\cdot\overrightarrow{dS}
-= \dfrac{1}{\epsilon_0} \cdot \iiint_{\Ltau} \rho \cdot d\tau = \dfrac{Q_{int}}{\epsilon_0}}`$**
-
 
 * *Maxwell-flux* :
 
-$`\left.\begin{array}{l}
-\cdot\cdot\cdot \\
-\cdot\cdot\cdot
-\end{array}\right\}
-\Longrightarrow`$
-**$`\mathbf{\cdot\cdot\cdot}`$**
+     
+  À tout instant t, et pour tout volume $`\tau`$ :
+
+   * $`\forall \overrightarrow{r}, div \overrightarrow{B} = 0`$
+  $`\Longrightarrow \iiint_{\Ltau} div \overrightarrow{B}\,d\tau = 0`$   
+
+   * $`\left.\begin{array}{l}
+\iiint_{\Ltau} div \overrightarrow{B}\,d\tau = 0 \\
+\iiint_{\Ltau} div\;\overrightarrow{B} \cdot d\tau = \displaystyle 
+\soiint_{S\leftrightarrow\Ltau} \overrightarrow{B}\cdot\overrightarrow{dS}
+\end{array}\right\}`$
+$`\Longrightarrow`$
+**$`\mathbf{\displaystyle \quad\oiint_{S\leftrightarrow\Ltau} \overrightarrow{B}\cdot\overrightarrow{dS}= 0}`$
 
 * *Maxwell-Faraday* :