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When the anharmonicity in the system is large, one should define the weights on the basis of the generalized equipartition theorem; for a discussion of this point see Ref. [16].
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The Poincaré-Fermi nonexistence theorem states that for a number N of degrees of freedom ≥ 3, no analytic or smooth integral of motion besides the energy exists for nonintegrable systems. Thus, the nonintegrable motions (those that do not live on KAM tori) belong to a connected component of phase space and the whole of any assigned constant energy surface of phase space is topologically accessible.
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26
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note
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We assume that even for the small amplitude considered by FPU a finite threshold exists, so that we can extrapolate our results to the FPU case.
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