Key points are not available for this paper at this time.
Two methods of constructing a potential, in the form of a series, from a given S phase shift are described. The convergence of one of these is analyzed. Examples show that it can converge comfortably even for potentials which are so strong as to have a bound state. The ambiguity of the potential, connected with the existence of bound states, is discussed in an appendix.
Jost et al. (Mon,) studied this question.