\text \begin{array}{c60|c60|c90|c60|c60|c60}& x < & -1 & < x < & 0 & < x_ \\\hline f'(x) & - & 0 & + & n. def. & +_ \\\hline G_f & f\ddot{a}llt & TIP\left(-1\,\left|\,\frac23\right.\right) & steigt & n. def. & steigt ^ \end{array}