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Re: F=ma

If E is kinetic energy and m is the mass (not the proper mass),
then "E does cause m to increase" And the relation becomes
linear for very large E. If E is the total energy, then you are
correct, we postulate that E, by the definition of m, is only
an equivalence. Instead of E we can say, mc^2, and vice versa.

Jim Green wrote:

... E=mc^2 which seems to be an equivalence
ie E _is_ mass -- not E "causes" mass