P. 256, lines -5 and -6

The equation should be

$ξ (t) = c_{1} ([\begin{matrix} 0 \\ ω_{n_{1}} \\ 0 \\ ω_{n_{1}} \end{matrix}] \cos ω_{n_{1}} t + [\begin{array}{c} 1 \\ 0 \\ 1 \\ 0 \end{array}] \sin ω_{n_{1}} t) + c_{2} ([\begin{matrix} 0 \\ ω_{n_{1}} \\ 0 \\ ω_{n_{1}} \end{matrix}] \sin ω_{n_{1}} t - [\begin{matrix} 1 \\ 0 \\ 1 \\ 0 \end{matrix}] \cos ω_{n_{1}} t) + c_{3} ([\begin{matrix} 0 \\ - ω_{n_{2}} \\ 0 \\ ω_{n_{2}} \end{matrix}] \cos ω_{n_{2}} t + [\begin{matrix} - 1 \\ 0 \\ 1 \\ 0 \end{matrix}] \sin ω_{n_{2}} t) + c_{4} ([\begin{matrix} 0 \\ - ω_{n_{1}} \\ 0 \\ ω_{n_{2}} \end{matrix}] \sin ω_{n_{2}} t + [\begin{matrix} 1 \\ 0 \\ - 1 \\ 0 \end{matrix}] \cos ω_{n_{2}} t) .$

Return to errata.

P. 256, lines -5 and -6

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