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Mathematically, we can decide if two events are timelike-separated or spacelike-separated by just looking at the sign of the spacetime interval between them.
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On the light cone, these are events on the left/right part of the cone.
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Different observers might not agree on the order of two spacelike-separated events.
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Further discussion at Section "Light cone".
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The opposite of those events are timelike-separated events.
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Ancestors

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