Equation Icon  ¯ ¯ L (uB,ζ,ζ) = ∂ (τ)G (τ, ζ,ζ), (3.31 ) uB = G (τ,ζ, ¯ζ) ⇔ τ = T (uB,ζ, ¯ζ), (3.32 )