Equation Icon  -1- [ μ i j μ − 1 μ ] L (ϕ,ρ,σ ) = − 2 λ ρ 𝔪ij(ϕ)∂ ϕ ∂μϕ − 2∂ ρ∂μσ − ρ ∂ ρ∂μρ , (3.16 )