In figure 3, several time sequences, corresponding to different values of the parameter r
are shown. When the parameter r increases, this effectively increases the steepness of the
parabola, which makes the slope of this tangent steeper, so that eventually the stability
condition is violated. The steady state then becomes unstable and the system undergoes
oscillations. When r further increases the periodic solution becomes unstable and higher
period oscillations are observed. When all the cycles become unstable, chaos is observed.
In the next section, we discuss the period-2 oscillations observed just beyond r = 3 and
its stability.