Formula_3777

\[\begin{gathered}\frac{d a^{\mu}}{d \tau}=\frac{g e}{2 m c} F^{\mu v} a_{v}-\frac{e}{m c}\left(\frac{g}{2}-1\right) u^{\mu} F^{v \lambda} u_{v} a_{\lambda}, \\\mu, v, \lambda=0,1,2,3,\end{gathered}\]