According to Einstein's Special Relativity, what did he take as a fundamental starting assumption?
Answer
The constancy of $c$ for all inertial observers
Einstein formalized Special Relativity by taking the constancy of $c$ as a postulate, building the theory on this principle along with the postulate that the laws of physics are the same for all non-accelerating observers.
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I finally understood why speed of light is a constant! (My mind is blown)
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