If the space time interval between two events is time like, then the temporal order of the two events is the same in every inertial reference frame.

Question

Quizplus · Accepted Answer

In a time-like interval, the separation between events is such that all observers in inertial frames will agree on the temporal order (which event happened first), because the interval can be traversed at a speed less than or equal to the speed of light, ensuring causality is preserved across all frames.

If the Space Time Interval Between Two Events Is Time