for the correctness of the theory (Einstein 1912: "This theory is correct to the extent to which the two principles upon which it is based are correct. Since these seem to be correct to a great extent, ...")

Postulates of special relativity

1. First postulate (principle of relativity)
: The laws of physics take the same form in all inertial frames of reference.

2. Second postulate (invariance of c)

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