(34) | e₁₁ e₁₂ e₁₃ e₁₄ | = | 1 0 0 0 |
| e₂₁ e₂₂ e₂₃ e₂₄ | | 0 1 0 0 |
| e₃₁ e₃₂ e₃₃ e₃₄ | | 0 0 1 0 |
| e₄₁ e₄₂ e₄₃ e₄₄ | | 0 0 0 1 |
For a 4 × 4 series-matrix, Det A shall denote the determinant formed of the 4 × 4 elements of the matrix. If det A ≠ 0, then corresponding to A there is a reciprocal matrix, which we may denote by A⁻¹ so that A⁻¹A = 1.
A matrix
f = | 0 f₁₂ f₁₃ f₁₄ |
| f₂₁ 0 f₂₃ f₂₄ |
| f₃₁ f₃₂ 0 f₃₄ |
| f₄₁ f₄₂ f₄₃ 0 |