Kovariante Ableitung

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