Equation Icon  b ˆ ¯ uB = ξ (τ)lb, τ = T (uB, ζ,ζ) L (uB,ζ, ¯ζ) = ξb(τ)ˆmb ^ ¯ a -- ¯ L (uB,ζ,ζ) = ξ (τ)mˆa (ζ,ζ),