ABSTRACT
In this first chapter, we shall take a quite general look at the nature of photons and electrons, in order to gain a familiarity with their overall properties, insofar as they bear upon our subject. Clearly it is useful to acquire this ‘feel’ in general terms before getting immersed in some of the finer detail which, whilst very necessary, does not allow the interrelationships between the various aspects to remain sharply visible. The intention is that the gentle familiarity acquired by reading this chapter will facilitate an understanding of the other chapters in the book.
