| Re: C squared
The scalar product of absolute acceleration (a) and the space-time metric (r) is the square of lightspeed (c): a∙r=c. However, since absolute acceleration is not detectable, c seems to lack physical meaning.
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Time independence: [∂E(g)]²=[∂F(a)×∂r(a)]·[∂F(b)×∂r(b)] and Mass independence: ¶a(t)·¶r(t)=c²
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