Three-momentum
= Three-momentum
{title2=$\mathbf p$}
<Three-momentum> is the spatial part of a particle's <four-momentum>, $p^\mu=(E/c,\mathbf p)$. Its components depend on the reference frame, while $p_\mu p^\mu=m^2c^2$ is a <Lorentz invariant>.
= Three-momentum
{title2=$\mathbf p$}
<Three-momentum> is the spatial part of a particle's <four-momentum>, $p^\mu=(E/c,\mathbf p)$. Its components depend on the reference frame, while $p_\mu p^\mu=m^2c^2$ is a <Lorentz invariant>.