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<p>which, by definition, cannot happen for frame vectors.</p>

<p><big>Nonspinning and inertial frames</big></p>
<p>Some frames are nicer than others. Particularly in <a href="page.php?w=vacuum_solution_%28general_relativity%29">vacuum</a> or <a href="page.php?w=electrovacuum_solution">electrovacuum solution</a>s, the physical experience of inertial observers (who feel no forces) may be of particular interest. The mathematical characterization of an inertial frame is very simple: the <a href="page.php?w=integral_curve">integral curve</a>s of the timelike</p><p>
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