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→...purports to relate all matter to light
::(Your footnote about the units is bogus. SI units are not arbitrary, since eg Joules can be derived from other SI units including kilograms, metres and seconds. Therefore, the relationship to light ''is'' (purported to be) a natural one.)--[[User:CPalmer|CPalmer]] 11:00, 29 March 2012 (EDT)
::(Your footnote about the units is bogus. SI units are not arbitrary, since eg Joules can be derived from other SI units including kilograms, metres and seconds. Therefore, the relationship to light ''is'' (purported to be) a natural one.)--[[User:CPalmer|CPalmer]] 11:00, 29 March 2012 (EDT)
::no, of course not, but we could write, e.g., Eε<sub>0</sub> = m/μ<sub>0</sub>: the relationship is given between mass and energy... [[User:AugustO|AugustO]] 11:04, 29 March 2012 (EDT)
Which footnote about units? [[User:AugustO|AugustO]] 11:04, 29 March 2012 (EDT)