ABSTRACT
The results of the last three sections show that the apparent incompatibility of the law of propagation of light with the principle of relativity (Section 7) has been derived by means of a consideration which borrowed two unjustifiable hypotheses from classical mechanics; these are as follows:
The time-interval (time) between two events is independent of the condition of motion of the body of reference.
The space-interval (distance) between two points of a rigid body is independent of the condition of motion of the body of reference.
