Although the formulas in Table 2.1 apply also to the wave vector and the four momentum.and can be used in each case also according to the active interpretation, the various situations have their indiv...Although the formulas in Table 2.1 apply also to the wave vector and the four momentum.and can be used in each case also according to the active interpretation, the various situations have their individual features, some of which will now be surveyed. The point in the preceding argument is that we achieve the transition from a state of rest of a particle to a state of motion, by the kinematic means of inertial transformation.