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Geometric object with magnitude (length) and direction.

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How can we be sure, that the dot-product of the four-vectors $U$ and $A$ in special relativi...

Thank very much. Both explanations are good. I would just like to say, that Yardan Sheffer's explanation just needed charlie's link to give the full explanation. So the answer in why they are orthogon …
JohanL's user avatar
  • 61
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3 answers
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How can we be sure, that the dot-product of the four-vectors $U$ and $A$ in special relativi...

I'am currently taking class in relativity and in the book that i have it is said that the four-vectors of velocity and acceleration is zero. I know that the invariance of the velocity is $-c^2$. …
JohanL's user avatar
  • 61