On the Birkhoff normal form of a completely integrable hamiltonian system near a fixed point with resonance
Thomas Kappeler, Yuji Kodama, Andras Némethi (1998)
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze
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On the Birkhoff normal form of a completely integrable hamiltonian system near a fixed point with resonance
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Jian-Guo Si, Xin-Ping Wang (1999)
Colloquium Mathematicae
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This paper is concerned with a second-order functional differential equation of the form with the distinctive feature that the argument of the unknown function depends on the state derivative. An existence theorem is established for analytic solutions and systematic methods for deriving explicit solutions are also given.
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Portugaliae mathematica
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