Galilean velocity addition
= Galilean velocity addition
{c}
{title2=$\boldsymbol v_{AC}=\boldsymbol v_{AB}+\boldsymbol v_{BC}$}
With parallel inertial axes and absolute time, differentiating a <Galilean transformation> adds relative <velocities> as ordinary <vectors>. This is the low-speed limit of <relativistic velocity addition>. At speeds comparable with the <speed of light>, absolute time is no longer the appropriate frame transformation, and the relativistic denominator cannot be neglected.