Equation Icon  [ ] gμν = exp λΦi ∂xi g0μν(σa,xi)|xi=0 (489) ∞ n = ∑ λ--Φi1 ⋅⋅⋅Φin (∂ i ⋅⋅⋅∂ i)g0 (σa,xi)| i . n=0 n! x1 xn μν x=0