Update cheatsheet.fr.md

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

@@ -87,11 +87,9 @@ RÉSUMÉ<br>
    \\
   &\Longrightarrow\quad\int_{N(t_1)}^{N(t_2)}\dfrac{dN}{N}=\int_{t_1}^{t_2} r\,dt\\
    \\
-   &\Longrightarrow\quad
-   \big[\,ln\,|N|\,\big]_{N(t_1)}^{N(t_2)}= r \,\big[\,t\,\big]_{t_1}^{t_2}\\
+   &\Longrightarrow\quad\big[\,ln\,|N|\,\big]_{N(t_1)}^{N(t_2)}= r \,\big[\,t\,\big]_{t_1}^{t_2}\\
    \\
-   &\Longrightarrow\quad
-   (ln\,|\underbrace{N(t_2)}_{\begin{array}{c}N>0\\|N|=N}\end{array}}-\,ln\,|N(t_1)| = r\,(t_2 - t_1)
+   &\Longrightarrow\quad(ln\,|\underbrace{N(t_2)}_{\begin{array}{c}N>0\\ \Rightarrow|N|=N}\end{array}}-\,ln\,|N(t_1)| = r\,(t_2 - t_1)
    \end{align}`$