  Considerations on the complementary time-dependent coordinate transformations
emboding Lorentz transformation (LT) show that the relativistic energy-momentum
relationship, implicitly the relativistic mass and energy, do not depend on the
square root appearing in LT, being associated to the absolute motion of a
particle and related to its inner structure. Results concerning the concept of
operational theory and its application to the electromagnetic and gravitational
field theories, as well as to the quantum mechanics are given in appendixes.
