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<p>the admissible frames of reference are <a href="page.php?w=inertial_frames">inertial frames</a> with relative velocities much smaller than the <a href="page.php?w=speed_of_light">speed of light</a>. Time is then absolute, and the transformations between admissible frames of references are <a href="page.php?w=Galilean_transformations">Galilean transformations</a>, which (together with rotations, translations, and reflections) form the <a href="page.php?w=Galilean_group">Galilean group</a>. The covariant physical quantities are <a href="page.php?w=Euclidean_space">Euclidean</a></p><p>
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