Fig. 5

Unsteady systems shown by phase trajectories of ODE \( \frac{dx}{dt}= Ax,TrA>0, detA>0 \): a unsteady stellar node corresponding to matrix \( A=\left(\begin{array}{cc}\hfill p\hfill & \hfill \hfill \\ {}\hfill \hfill & \hfill p\hfill \end{array}\right) \); b unsteady node corresponding to \( A=\left(\begin{array}{cc}\hfill m\hfill & \hfill \hfill \\ {}\hfill \hfill & \hfill n\hfill \end{array}\right) \); c improper node corresponding to \( A=\left(\begin{array}{cc}\hfill m\hfill & \hfill 1\hfill \\ {}\hfill \hfill & \hfill m\hfill \end{array}\right) \); d unsteady focus corresponding to \( A=\left(\begin{array}{cc}\hfill a\hfill & \hfill b\hfill \\ {}\hfill -b\hfill & \hfill a\hfill \end{array}\right) \)