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by Albert EinsteinOctober 16th, 2022

*Relativity: The Special and General Theory by Albert Einstein is part of HackerNoon’s Book Blog Post series. You can jump to any chapter in this book **here**.*

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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