For a time-like interval between 2 events, it is impossible to find an inertial reference frame in which the events occur at the same time. This can be seen from the space-time interval s[itex]^{2}[/itex]=c[itex]^{2}[/itex]t[itex]^{2}[/itex]-l[itex]^{2}[/itex] where s must be real number for a time-like interval.(adsbygoogle = window.adsbygoogle || []).push({});

However, how does it follow from this that one cannot find a frame in which they occur in thereverseorder?

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# Time-like intervals

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