T = root((t2 - t1)^2 - (x2 - x1)^2)(adsbygoogle = window.adsbygoogle || []).push({});

As I understand it, T is proper time as measured in someone's intertial frame, and (x2 - x1)^2 is their movement through space... but in what frame is (t2 - t1)^2 measured?

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# Question about this equation

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