Summary and Results

The typical thesis paradigm consists of a single isolated problem statement, followed by a development culminating in a main result. Because this thesis is intended not only as an exposition of results but as a review of and introduction to scattering methods, it would have been somewhat unnatural and probably detrimental to arrange the material in this way. We have thus attempted to interleave review, problems and results in a more natural order. Because of this, it might be a little difficult for the reader to tell what the principal new results were. We here provide a chapter-by-chapter summary, with results appearing in the sections indicated by bold-faced numbers.