Hey, I read that if a four-vector is 'four-orthogonal' to a time-like four vector then it must be space-like. I showed this quite easily.(adsbygoogle = window.adsbygoogle || []).push({});

I also read that a space-like vector can be orthogonal to another space-like vector, but cant seem to prove it. I wondered if someone could help me.

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# Orthogonal space-like vectors.

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