Abstract

The Lorentz transformations reflecting the properties of space-time were originally obtained by Lorentz through an analysis of the electromagnetic field equations, and were then derived by Einstein on the basis of two postulates — the principle of relativity and the principle of the constancy of the velocity of light. Einstein formulated these postulates in the following manner: 1. The laws which govern the changes of state of a physical system are independent of the choice of two-coordinate systems moving relatively to each other with a uniform translational motion for the formulation of these laws. 2. Each ray of light in a coordinate system “at rest” moves with a fixed velocity c independently of whether this light ray is emitted by a stationary or moving body.

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