Question: For a nonzero quadrivector that is null or temporal and called V, show that if vo > 0 in one reference frame, then Vo

For a nonzero quadrivector that is null or temporal and called V", 

For a nonzero quadrivector that is null or temporal and called V", show that if vo > 0 in one reference frame, then Vo > 0 in all reference frames.

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