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Feb 7, 2021 at 21:50 comment added Pablo I think you are mistaken. The order of causally disconnected events may not be the same for two different observers. As they are causally disconnected, this is no paradox. The ones which are causally connected are the ones who preserve the order. Use the diagram in your picture and try to find a reference system in which 2 causally connected events A $\rightarrow$ B appear as B $\rightarrow$ A. You'll find that that observer must travel at $v>c$.
Feb 5, 2021 at 15:21 answer added mmesser314 timeline score: 2
Feb 5, 2021 at 15:21 comment added jng224 Possibly related: Why is causality preserved in special relativity?
Feb 5, 2021 at 15:00 history asked Pərviz Piri CC BY-SA 4.0