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November 4th, 2019, 09:26 AM  #1 
Newbie Joined: Nov 2019 From: Germany Posts: 1 Thanks: 0  What does substitute mean in this context?
I was reading a book about special relativity when I saw this blok: AEscreenshot.jpg (1) $\displaystyle s^2 = \Delta x_1^2 + \Delta x_2^2 + \Delta x_3^2$ My problem is the substitution of (2a). I don't understand how this substitution looks like or how it works. This question might be stupid or in the wrong forum, but I really need help. Last edited by skipjack; November 4th, 2019 at 12:03 PM. 

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