Kovariante Ableitung

${A^{\lambda }}_{\mu ;\nu }=\frac{\partial {A^{\lambda }}_{\mu }}{\partial x^{\nu }}+{\mathrm{\Gamma }}_{\rho \nu }^{\lambda }{A^{\rho }}_{\mu }-{\mathrm{\Gamma }}_{\mu \nu }^{\rho }{A^{\lambda }}_{\rho }$