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

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

@@ -112,7 +112,7 @@ $`\Phi_E = \displaystyle \oiint_{S\leftrightarrow\tau} \overrightarrow{E}\cdot\o
 = \dfrac{1}{\epsilon_0} \cdot \iiint_{\tau} \rho \cdot d\tau = \dfrac{Q_{int}}{\epsilon_0} `$
 
 $`\left.\begin{array}{l}
-$`\Phi_E = \displaystyle \oiint_{S\leftrightarrow\tau} \overrightarrow{E}\cdot\overrightarrow{dS}
+\Phi_E = \displaystyle \oiint_{S\leftrightarrow\tau} \overrightarrow{E}\cdot\overrightarrow{dS}
 = \dfrac{Q_{int}}{\epsilon_0} `$ \\
 2\pi \rho_M\, h\,E= \dfrac{\pi\,\rho_M^2\,h\, \dens^{3D}_0}{\epsilon_0}
 \end{array}\right\}