Equation Icon  ( ||∂h (t;ξ)) F(𝒜)ij(ξ) := hi(t;ξ)||---j----- , i,j = 1,...,n, 𝒜 = 1,...,m, (66 ) ∂ ξ𝒜 (∂h (t;ξ )||∂h (t;ξ)) S(𝒜ℬ)ij(ξ) := ---i-----||--j------ , i,j = 1,...,n, 𝒜,ℬ = 1,...,m. (67 ) ∂ξ𝒜 ∂ξℬ