Line -9 should be:
ξ ( t ) = c 1 ξ 1 e λ 1 t + ⋯ + c n ξ n e λ n t {\displaystyle \xi (t)=c_{1}\xi ^{1}e^{\lambda _{1}t}+\cdots +c_{n}\xi ^{n}e^{\lambda _{n}t}}
and line -7 should be
ξ ( t ) = c 1 ξ 1 + ⋯ + c n ξ n {\displaystyle \xi (t)=c_{1}\xi ^{1}+\cdots +c_{n}\xi ^{n}}
Return to errata.
