(b) The point 1  1/s is fixed, and even though it is
unstable, starting exactly there the iteration stays there. To find other points not
converging to the stable 2cycle, reverse graphical iteration from the fixed point.
This produces two infinite sequences of points (one accumulating at x = 0, the other at
x = 1) going to the fixed point, hence not converging to the 2cycle. Of course, x = 0
and x = 1 behave as they did in (a), and so don't converge to the 2cycle. The inverse
graphical iteration process is illustrated by the dashed lines in the figure below
(s = 3.4).
