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Einstein's original paper question 
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#1
Oct2006, 10:03 PM

P: 1

Hi, by reading the Einstein's original derivation of the E=mc2 formula (http://www.fourmilab.ch/etexts/einstein/E_mc2/www/), Einstein does an
approximation by neglecting higher order derivatives before arriving at E=mc2. But, as far as I know, E equals mc2 precisely. Does anyone know why Einstein didnt derive the equation precisely? I tried to play with the paper a bit to make it spit out the precise equation but didnt have much luckI must be overlooking something. Could someone help me with this one? 


#2
Oct2006, 10:35 PM

P: 329

[tex]E^2(pc)^2=(mc^2)^2[/tex] For p=0 you obtain [tex]E=mc^2[/tex] exactly The above can be written a little nicer if we take c=1: [tex]<E,E><p,p>=m^2[/tex] where <,> represents the dot product. In the proper frame of the object p is 0 therefore E=m 


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