  A self-contained derivation of the formalism describing Weyl, Majorana and
Dirac fields from a unified perspective is given based on a concise description
of the representation theory of the proper orthochronous Lorentz group.
Lagrangian methods play no role in the present exposition, which covers several
fundamental aspects of relativistic field theory which are commonly not
included in introductory courses when treating fermionic fields via the Dirac
equation in the first place.
