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Originally Posted by GUILLE From what numbers are the spatial frequency and temporal frequency derived? | The spatial is derived from Dy=y2-y1 and the temporal is derived from Dt=t2-t1. The product of these are the space-time interval of special relativity which is an invariant and with the value of zero.
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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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