The aim of this volume is twofold. First, it is an attempt to simplify
and clarify the relativistic theory of the hydrogen-like atoms. For this
purpose we have used the mathematical formalism, introduced in the Dirac
theory of the electron by David Hestenes, based on the use of the real
Cli?ord algebra Cl(M) associated with the Minkwoski space-time M, that
is, the euclidean 4 R space of signature (1,3). This algebra may be
considered as the extension to this space of the theory of the Hamilton
quaternions (which occupies an
importantplaceintheresolutionoftheDiracequationforthecentralpotential
problem). The clarity comes from the real form given by D. Hestenes to
the electron wavefunctionthatreplaces, inastrictequivalence,
theDiracspinor.Thisform is directly inscribed in the frame of the
geometry of the Minkwoski space in which the experiments are necessarily
placed. The simplicity derives from the uni?cation of the language used
to describe the mathematical objects of the theory and the data of the
experiments. The mathematics concerning the de?nition and the use of the
algebra Cl(M) are not very complicated. Anyone who knows what a vector
space is will be able to understand the geometrical implications of this
algebra. The lecture will be perhaps more di?cult for the readers
already acquainted with the complex formalism of the matrices and
spinors, to the extent that the new language will appear di?erent from
the one that they have used. But the correspondence between the two
formalisms is ensured in the text at each stage of the theory.