The Two Postulates

Here are the two postulates of Special Relativity:

1. The laws by which the states of physical systems undergo change are not affected, whether these changes of state be referred to the one or the other of two systems of co-ordinates in uniform translatory motion
2. Any ray of light moves in the “stationary” system of co-ordinates with the determined velocity c, whether the ray be emitted by a stationary or by a moving body.

* Unless specifically pointed out, all reference frames used in this paper are inertial, meaning that they are either at rest or in uniform motion.

As there are many things to go over, we will split the content into 3 sections:

• The first postulate
• The second postulate
• The cause of self-contradiction

In the next section, we will talk about the first postulate.