The velocity of a moving point
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(2')
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where is the velocity in any direction perpendicular to R.
The relative velocity of two moving points
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(4')
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The distance between two points (r, t), (r', t') at the time T corresponding to (r, t),
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(3')
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The element of volume
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(5')
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The density of free electricity
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(6')
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The current density
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(7')
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The polarization
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(8')
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