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March 29, 2015

Posted by **kayla** on Monday, February 11, 2013 at 9:38pm.

Two events that are simultaneous in one inertial frame of reference will not necessarily be simultaneous in any other inertial frame of reference.

Thank you

- physics -
**drwls**, Tuesday, February 12, 2013 at 12:58amThis is one of the fundamental postulates of the special theory of relativity. It has been proven experimentally to be true.

The separation of two events in space time can be written

dx^2 + dy^2 + dz^2 - c^2 dt^2

That quantity is invariant when transforming from one intertial coordinate system to another. It is possible for the spatial separation of the two events in four-dimensional spacetime to increase while the time interval decreases or become zero.

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