rs or Micromass but simplyРreflects the large amount of writing that had to be done and the needs of the greatest proportionРof users.Р For various reasons, it has been decided to close the present series of Back-to-Basics andРcollect the articles in a book that can be placed on a shelf and used as a reference source. It is anРunusual book format, having a large number of rather short chapters together with a collection ofРbrief summaries, included as Appendix A. Thus the book will still serve the dual purposes ofРdescribing fundamentals and additionally providing a concise synopsis of each article.Р In another departure from regular scientific book format, no attempt has been made to includeРreferences inside each chapter. This approach was intentional from the start because the basics that