What two fundamental invariants does the Special Theory of Relativity postulate?

Answer

The laws of physics are the same for all observers in uniform motion, and the speed of light in a vacuum is constant.

The Special Theory of Relativity is founded on two invariants: the principle that the laws of physics are invariant for observers in uniform motion, and the constancy of the speed of light ($c$) regardless of the observer's motion.

What two fundamental invariants does the Special Theory of Relativity postulate?

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