P. 245, line 8

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Use:

A_7 = \left[ \begin{array}{cccc}   2  & -7 &  6 & -7 \\
   0 &  1 &  0 & -7 \\
   0 & -7 &  8 & -7 \\
   0 &  0 &  0 &  8
 \end{array}\right]

instead. This matrix has repeated eigenvalues, but a linearly independent set of 4 eigenvectors.

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