ABSTRACT
Physicist Paul Dirac solved a problem – that of the relativistic electron. Not only was this a major achievement, but along the way, he introduced the concept of antimatter before such particles were even recognised and also accounted for the property of spin – previously added as an afterthought to Schrödinger’s equation. This chapter assumes no prior knowledge of Dirac’s methods and presents his major findings at an intermediate level, the results of which are later used in the construction of Feynman diagrams.
