_x__{_h_} = α_{_h_1} _x₁′_ + α_{_h_2} _x₂_′ + α_{_h_3} _x₃′_ + α_{_h_4}
_x₄′_ (_h_ = 1,2,3,
which is accomplished by the matrix
A = | α₁₁, α₁₂, α₁₃, α₁₄ |
| |
| α₂₁, α₂₂, α₂₃, α₂₄ |
| |
| α₃₁, α₃₂, α₃₃, α₃₄ |
| |
| α₄₁, α₄₂, α₄₃, α₄₄ |
will be denoted as the transformation A.