Update cheatsheet.fr.md

12.temporary_ins/32.sets-systems/30.n3/20.systems/20.overview/cheatsheet.fr.md

@@ -409,8 +409,8 @@ L'une représente des proies et l'autre des prédateurs.
   <br>
   **$`\left.\begin{array}{l}
     \forall t \in \mathbb{R}, \\
-    \left.\dfrac{dX_1^*}{dt}\right\vert_t=0 \\
-    \left.\dfrac{dX_2^*}{dt}\right\vert_t=0
+    \left.\dfrac{dX_1^*}{dt}\right\vert_{\,\bigt}=0 \\
+    \left.\dfrac{dX_2^*}{dt}\right\vert_{\,\bigt}=0
     \end{array}\right\}
     \Longrightarrow\;(X_1^*,X_2^*)`$** est **stationnaire**.
 
@@ -437,17 +437,17 @@ L'une représente des proies et l'autre des prédateurs.
 
       $`\Longrightarrow\left\{\begin{array}{l}
       \forall t \in \mathbb{R}, \\
-      \left.\dfrac{dX_1^*}{dt}\right\vert_t=+C_1\,\dfrac{D_2}{C_2}-D_1\,\dfrac{D_2}{C_2}\dfrac{C_1}{D_1}\\
-      \left.\dfrac{dX_2^*}{dt}\right\vert_t=-D_2\,\dfrac{C_1}{D_1}+C_2\,\dfrac{D_2}{C_2}\dfrac{C_1}{D_1}
+      \left.\dfrac{dX_1^*}{dt}\right\vert_{\,\bigt}=+C_1\,\dfrac{D_2}{C_2}-D_1\,\dfrac{D_2}{C_2}\dfrac{C_1}{D_1}\\
+      \left.\dfrac{dX_2^*}{dt}\right\vert_{\,\bigt}=-D_2\,\dfrac{C_1}{D_1}+C_2\,\dfrac{D_2}{C_2}\dfrac{C_1}{D_1}
       \end{array}\right.`$
       
       **$`\mathbf{\Longrightarrow\left\{\begin{array}{l}
       \forall t \in \mathbb{R}, \\
-      \left.\dfrac{dX_1^*}{dt}\right\vert_t=0\\
-      \left.\dfrac{dX_2^*}{dt}\right\vert_t=0
+      \left.\dfrac{dX_1^*}{dt}\right\vert_{\,\bigt}=0\\
+      \left.\dfrac{dX_2^*}{dt}\right\vert_{\,\bigt}=0
       \end{array}\right.}`$**
       
-      *$`\mathbf{\Longrightarrow \left( X_1^*=\dfrac{D_2}{C_2},X_2^*=\dfrac{C_1}{D_1}\right)}`$* est *stationnaire*.
+      *$`\Longrightarrow \left( X_1^*=\dfrac{D_2}{C_2} , X_2^*=\dfrac{C_1}{D_1} \right)`$* est *stationnaire*.
       
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