as was to be shown.
The above observations and computations show that for points sufficiently close to the origin, at least, the graph of y=f(R) lies above the graph of =R . But then the bounded of y=f(R) implies that these two curves intersect at at least one point. That there is in fact at most one solution (fixed point), R^*, to equation (3) follows from the concavity of the graph by y=f(x) in [0,∞). This analysis suggests an iteration of the form.