Equation Icon  ∑ ui(Λ ) = ui(μ )Vi,0(μ) + λℓVi,ℓ(u(μ),Λ, μ), ℓ≥1 ∑ (2.1 ) χΛ = χ μ + λ ℓΞℓ(χμ; u(μ),Λ, μ). ℓ≥1