The formula is:
$v = \frac{v_1 + v_2}{1 + \frac{v_1 v_2}{c^2}}$
where $v$ is the velocity of the electron relative to the lab, $v_1$ is the velocity of the proton relative to the lab, $v_2$ is the velocity of the electron relative to the proton, and $c$ is the
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