P. 205, lines -7 and -9

Line -9 should be:

$\xi (t)=c_1{\xi }^1{e}^{{\lambda }_{1}t}+\cdots +c_n{\xi }^n{e}^{{\lambda }_{n}t}$

and line -7 should be

$\xi (t)=c_1{\xi }^1+\cdots +c_n{\xi }^n$

Return to errata.