  {This paper is a comparison of the Minkowski, Einstein and Einstein dual
theories of relativity. The dual is based on an identity relating the observer
time and the proper time as a contact transformation on configuration space,
which leaves phase space invariant. The theory is dual in that, for a system of
$n$ particles, any inertial observer has two unique sets of global variables
$({\bf{X}}, t)$ and $({\bf{X}}, \tau)$ to describe the dynamics. Where
${\bf{X}}$ is the (unique) canonical center of mass. In the $({\bf{X}}, t)$
variables, time is relative and the speed of light is unique, while in the
$({\bf{X}}, \tau)$ variables, time is unique and the speed of light is relative
with no upper bound. The two sets of particle and Maxwell field equations are
mathematically equivalent, but the particle wave equations are not. The dual
version contains an additional longitudinal radiation term that appears
instantaneously with acceleration, does not depend on the nature of the force
and the Wheeler-Feynman absorption hypothesis is a corollary.
  The homogenous and isotropic nature of the universe is sufficient to prove
that a unique definition of Newtonian time exists with zero set at the big
bang. The isotopic dual of $\R$ is used to improve the big bang model, by
providing an explanation for the lack of antimatter in our universe, a natural
arrow for time, conservation of energy, momentum and angular momentum. This
also solves the flatness and horizon problems without inflation.
  We predict that radiation from a betatron (of any frequency) will not produce
photoelectrons, that matter and antimatter are gravitationally repulsive and
that data from distant sources does not have a unique physical interpretation.
We provide a table showing the differences between the Minkowski, Einstein and
dual versions of the special theory.}
