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After reading some fairly elementary texts on special relativity, I understand length contraction and time dilation no problem, as it is well explained with examples of proofs, but I hate to say that relativistic mass is explained nowhere. I know this question has probably been asked before, but I will ask it anyway: Is there a fairly simple proof for relativistic mass, just as there is for length contraction and time dilation? Is it something to do with spacetime momentum four vector or something along those lines? I would really love to understand this, as it would allow me to understand special relativity more fully in order to read about general realtivity etc.

Any answer would be gratefully appreciated.

Thanks, Dom

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# Relativistic mass thought experiment/proof?

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