Equation Icon  i i i i D ℐ:ℂ = qξ (s), D ℂ = q√η-(s), (3.91 ) k k i i j′ 2 −1 ik′′ i ξ = η − --η η 𝜖ijk − ---q Qℂ ξ , (3.92 ) 2 1√0-- ηk = ξk + i1ξiξj′𝜖 + --2q−1Qik′′ξi (3.93 ) 2 ijk 10 ℂ