Update textbook.fr.md

12.temporary_ins/20.magnetostatics-vacuum/40.ampere-theorem-applications/05.ampere-symetries-invariances/10.main/textbook.fr.md

@@ -194,13 +194,13 @@ Si de plus la distribution de courants $`\overrightarrow{j}`$ est invariante par
 \end{array}\right\}}`$
 $`\mathbf{\Longrightarrow \overrightarrow{j} = \overrightarrow{j} (\beta)\Longrightarrow \overrightarrow{B}=\overrightarrow{B}\,(\beta)}`$**
 
-$`\require{cancel}\begin{align}\left.
-\begin{array}
+**$`\require{cancel}\begin{align}\left.
+\begin{align}
 &\overrightarrow{j}\,(\xcancel{\alpha},\beta, \gamma) =\overrightarrow{j}\,(\beta,\gamma) \\
 &\overrightarrow{j}\,(\alpha,\beta, \xcancel{\gamma}) =\overrightarrow{j}\,(\alpha,\beta)
-\end{array}\right\}&\Longrightarrow \overrightarrow{j} = \overrightarrow{j} (\beta)\\
+\end{align}\right\}&\Longrightarrow \overrightarrow{j} = \overrightarrow{j} (\beta)\\
 &\Longrightarrow \overrightarrow{B}=\overrightarrow{B}\,(\beta)
-\end{align}`$
+\end{align}`$**
 
 
 ##### Etude des symétries