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For the constant coefficient problem, the characteristic polynomial relating frequencies to spatial wavenumber
, from (3.10), will be
The first factor, which is similar in form to that which defines the Timoshenko system, from (5.19), has four roots,
,
which behave as
and the second factor has a pair of roots
, which have the limiting behavior
All phase and group velocities are thus bounded. For the varying-coefficient problem, the maximum global group velocity will be
Stefan Bilbao
2002-01-22