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November 4th, 2019, 09:26 AM   #1
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Question 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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