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<H1><A NAME="SECTION00070000000000000000">Lyapunov exponents</A></H1>
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Chaos arises from the exponential growth of infinitesimal perturbations,
together with global folding mechanisms to guarantee boundedness of the
solutions. This exponential instability is characterized by the spectrum of
Lyapunov exponents&nbsp;[<A HREF="citation.html#EckRu