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Can some one please provide (a link to) the most rigorous proof of [itex]E_0 = mc^2[/itex]?

Actually, I got stuck on this question: why doesn't [itex]E_0 = mc^2 + \rm{const}[/itex]? How to prove that [itex]\rm{const} = 0[/itex]?

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# E0=mc^2 proof

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