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The validity of the Lorentz transformation follows from this condition. We can express this as follows: The magnitude
is independent of the choice of the body of reference. We call the magnitude ds the “distance” apart of the two events or four-dimensional points.
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Einstein, Albert, 2004. Relativity: The Special and General Theory. Urbana, Illinois: Project Gutenberg. Retrieved May 2022 from https://www.gutenberg.org/files/5001/5001-h/5001-h.htm#ch26
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