Let $A \in \mathbb{C}^{N \times N}$ be a D6159: Complex square matrix such that
| (i) | $A$ is an D5948: Upper triangular complex matrix |
| (ii) | \begin{equation} A = \begin{bmatrix} A_{1, 1} & A_{1, 2} & \cdots & A_{1, N} \\ 0 & A_{2, 2} & \vdots & A_{2, N} \\ \vdots & \cdots & \ddots & \vdots \\ 0 & 0 & \cdots & A_{N, N} \end{bmatrix} \end{equation} |
Then $A_{1, 1}, \, A_{2, 2}, \, \ldots, \, A_{N, N}$ is a D6192: Complex matrix eigenvalue sequence for $A$.