Equation Icon  ( ) ( ) (√ --- ) 1√ --- ∑ √ ---∑ 1√ --- ∑ δ − gΛ = -- − g( Ψδ μλ + n μxμxλ) gλνδgμν − − g fxνξνx + ∇ ν( -- − g μ νxλτnxλτμξμx)(1,81 ) 2 x= {n,s} x={n,s} 2 x={n,s}