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A matrix of the form
![\begin{displaymath}
\left[{\matrix{
a_{11} & a_{12} & a_{13} & \cdots & a_{1(n-1...
...a_{(n-1)n}\cr
0 & 0 & 0 & 0 & a_{n(n-1)} & a_{nn}\cr}}\right].
\end{displaymath}](h_1570.gif)
References
Press, W. H.; Flannery, B. P.; Teukolsky, S. A.; and Vetterling, W. T. ``Reduction of a General Matrix to
Hessenberg Form.'' §11.5 in
Numerical Recipes in FORTRAN: The Art of Scientific Computing, 2nd ed. Cambridge, England:
Cambridge University Press, pp. 476-480, 1992.