Curves

Accessible region

$A_{ℝ}$

$L_0$

$\begin{array}{l}\left]-\infty ,u_1\right]\cup \left\{u_2=u_3\right\}\cup \left[u_4,+\infty \right[\\ \times \left]-\infty ,v_1\right]\cup \left[v_2,v_3\right]\cup \left[v_4,+\infty \right[\end{array}$

$S+2{\mathcal{R}}_v+2C+4{\mathcal{R}}^2$

${L^{\prime }}_0$

$\begin{array}{l}\left]-\infty ,u_1\right]\cup \left[u_2,u_3\right]\cup \left[u_4,+\infty \right[\\ \times \left]-\infty ,v_1\right]\cup \left\{v_2=v_3\right\}\cup \left[v_4,+\infty \right[\end{array}$

$S+2{\mathcal{R}}_u+2C+4{\mathcal{R}}^2$