Hey! So the formula for time dilation is:(adsbygoogle = window.adsbygoogle || []).push({});

[tex] \gamma \Delta t_0 = \Delta t[/tex], where ##\Delta t_0## is the time elapsed for a traveller ##S'## who has a relative constant velocity ##u## compared to a stationary observer ##S##, while ##\Delta t## is the time elapsed for the stationary observer.

However.. Since everything is relative, you could also say that it's the other way around: ##S## is "travelling" with a constant velocity ##-u## compared to the "stationary" ##S'##, and thus the foruma for time elapsed is also [tex] \gamma \Delta t = \Delta t_0[/tex]

Uhm, which one is correct? I assume it is the first one, provided ##S'## was accelerated from a relative speed of ##0## to ##u##? Or are both correct, depending on the observer?

I'm asking because I bumped into this problem when I was figuring out the lorentz-transformations.

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# Twin paradox - easy question

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