Update cheatsheet.fr.md

12.temporary_ins/08.conservative-vector-fields/20.conservative-vector-fields-properties/20.overview/cheatsheet.fr.md

@@ -433,16 +433,17 @@ $`\mathbf{d\phi=\left.\dfrac{\partial \phi}{\partial \alpha}\right|_M\cdot dl_{\
 
 La comparaison terme à terme de ces deux expressions de $'d\phi`$ donne :
 
-$`X_{\alpha}=\dfrac{\partial \phi}{\partial \alpha}\,\dfrac{\partial \alpha}{\partial dl_{\alpha}}`$   
-$`X_{\beta}=\dfrac{\partial \phi}{\partial \beta}\,\dfrac{\partial \beta}{\partial dl_{\beta}}`$
+$`X_{\alpha}=\dfrac{\partial \phi}{\partial \alpha}\,\dfrac{\partial \alpha}{\partial dl_{\alpha}}`$ ,   
+$`X_{\beta}=\dfrac{\partial \phi}{\partial \beta}\,\dfrac{\partial \beta}{\partial dl_{\beta}}`$ , 
 $`X_{\alpha}=\dfrac{\partial \phi}{\partial \gamma}\,\dfrac{\partial \gamma}{\partial dl_{\gamma}}`$
 
 Soit
 
-$`\color{brown}{\mathbf{\overrightarrow{grad}\,\phi=
-\dfrac{\partial \alpha}{\partial dl_{\alpha}\,\dfrac{\partial \phi}{\partial \alpha}\,\overrightarrow{e_{\alpha}}
-+\dfrac{\partial \beta}{\partial dl_{\beta}\,\dfrac{\partial \phi}{\partial \beta\,\overrightarrow{e_{\beta}}
-+\dfrac{\partial \gamma}{\partial dl_{\gamma}\,\dfrac{\partial \phi}{\partial \gamma}\,\overrightarrow{e_{\gamma}}
+$`\color{brown}{\mathbf{
+\overrightarrow{grad}\,\phi=
+\dfrac{\partial \alpha}{\partial dl_{\alpha}}\,\dfrac{\partial \phi}{\partial \alpha}\,\overrightarrow{e_{\alpha}}
++\dfrac{\partial \beta}{\partial dl_{\beta}}\,\dfrac{\partial \phi}{\partial \beta}\,\overrightarrow{e_{\beta}}
++\dfrac{\partial \gamma}{\partial dl_{\gamma}}\,\dfrac{\partial \phi}{\partial \gamma}\,\overrightarrow{e_{\gamma}}
 }}`$