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I've been reading about four-vectors and I have two quick questions:

If the position 4-vector is timelike, are the corresponding momentum and acceleration vectors also timelike? If the position 4-vector is spacelike, are the corresponding momentum and acceleration vectors also spacelike? Why?

Also, I understand the physical meaning of timelike and spacelikeintervals, i.e. that if an interval between two events is timelike the events can have a causal link. But what's the physical meaning of timelike and spacelikevectors?

Thanks in advance! :-)

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# Timelike and Spacelike Four-vectors

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