Hi, I am reading the Einstein original paper on Special Relativity, in this link (English translation), I am having difficulties on this sentence:(adsbygoogle = window.adsbygoogle || []).push({});

"We have now to show, that every ray of light moves in the moving system with a velocityc(when measured in the moving system), in case, as we have actually assumed,cis also the velocity in the stationary system ; for we have not as yet adduced any proof in support of the assumption that the principle of relativity is reconcilable with the principle of constant light-velocity."

Why does he need to show that c is constant also in the moving system if that is a principle? Is it necessary? Is it done for completeness or really he does need to show to complete the demonstration?

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# Question on Einstein original paper

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