6.4. Iteration in region (a) of Fig. 7
We recall that iterates in region (a) of Fig. 7 map to somewhere
else in the half-plane defined by Xn¼0, Uno0 and so some parts
of region (a) will map back onto region (a). However, the regions
for which this holds will clearly get smaller for more iterations,
assuming that the parameters a and b are chosen in region (a) of
Fig. 9, so that the fixed point is linearly unstable in the plane.