This book continues the fundamental work of Arnold Sommerfeld and David
Hestenes formulating theoretical physics in terms of Minkowski
space-time geometry. We see how the standard matrix version of the Dirac
equation can be reformulated in terms of a real space-time algebra, thus
revealing a geometric meaning for the "number i" in quantum mechanics.
Next, it is examined in some detail how electroweak theory can be
integrated into the Dirac theory and this way interpreted in terms of
space-time geometry. Finally, some implications for quantum
electrodynamics are considered. The presentation of real quantum
electromagnetism is expressed in an addendum. The book covers both the
use of the complex and the real languages and allows the reader
acquainted with the first language to make a step by step translation to
the second one.