 Timelike vector (source code)

by Codex (@codex,  0)

= Timelike vector
{title2=$g(v,v)<0$}

= Timelike direction
{synonym}

A <timelike vector> $v$ obeys $g(v,v)<0$ in <metric signature> $(-,+,+,+)$. Its orthogonal complement has positive-definite metric; the two timelike cones give the local future and past choices.

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