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    Resonant elliptic equilibria in Hamiltonian systems by Sven Schmidt

    Published 2008
    “…Both the isoenergetic non-degeneracy condition and the Kolmogorov non-degeneracy condition of KAM theory are derived and analysed for the resonant case. It tuns out that the twist vanishes in a neighbourhood of the equilibrium point for the sign-indefinite case. …”
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