Update cheatsheet.fr.md

12.temporary_ins/90.electromagnetism-in-vacuum/20.electromagnetic-waves-vacuum/20.overview/cheatsheet.fr.md

@@ -153,30 +153,14 @@ puis d'une onde plane progressive monochromatique (OPPM).
      $`\Longrightarrow\left\{
      \begin{align}
      &\dfrac{\partial E_x}{\partial x}+\dfrac{\partial E_y}{\partial y}
-     +\dfrac{\partial E_x}{\partial x}=0\\
+     +\dfrac{\partial E_z}{\partial z}=0\\
      \\
      &\dfrac{\partial E_x}{\partial x}=\dfrac{\partial E_y}{\partial y}=0
      \end{align}\right\}`$
      $`\Longrightarrow\;\dfrac{\partial E_z}{\partial z}=0`$   
-     <br>
-     $`\left.
-     \begin{align} &\underbrace{div(\overrightarrow{E}=\dfrac{\dens}{\epsilon_0}=0}_{\color{blue}{\text{th. de Gauss}
-     \text{\\dans le vide}}}\\
-     \\
-     &\overrightarrow{E}\text{ uniforme}\\
-     &\text{dans tout plan }\perp\overrightarrow{e_z}\end{align}\right\}`$   
-     <br>
-     $`\Longrightarrow\left\{
-     \begin{align}
-     &\dfrac{\partial E_x}{\partial x}+\dfrac{\partial E_y}{\partial y}
-     +\dfrac{\partial E_x}{\partial x}=0\\
-     \\
-     &\dfrac{\partial E_x}{\partial x}=\dfrac{\partial E_y}{\partial y}=0
-     \end{align}\right\}`$
-     $`\Longrightarrow\;\dfrac{\partial E_z}{\partial z}=0`$
-
+    
     <br>
-   * Le théorème de *Maxwell-Faraday* implique :   
+   * Le théorème de *Maxwell-Faraday* implique dans le vide :   
      <br>
      $`\begin{align} \color{blue}{\overrightarrow{rot}\,overrightarrow{E} &= -\dfrac{\partial \overrightarrow{B}}{\partial t}} \\
       \\