Errata: At end of Example 5.5, real part of eigenvalues has incorrect sign
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Location: page 145, line 8-9
The text describing the eigenvalues for the two sets of modes should read
one mode with eigenvalues
(for
small), and the states
and
another mode with
.
(Contributed by J. W. Kim, 1 Nov 2011)

small), and the states
and
another mode
with 