Equation Icon  ∏ ∘ -------- ∏ ∘ --------( ) 𝒟 χ := dχi det 𝔥(χ) = d ξi det𝔥(¯χ ) 1 − 1Rij(¯χ)ξiξj + ... =: 𝒟ξ. (B.28 ) x x 6