Abstract
This paper contains a detailed study of the flow that the classical Hamiltonian
induces inR 4,\(\mathcal{O}_3 \) representing a convergent power series that begins with a third order term.
In particular the existence and stability of periodic orbits is investigated.
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Kummer, M. On resonant non linearly coupled oscillators with two equal frequencies. Commun.Math. Phys. 48, 53–79 (1976). https://doi.org/10.1007/BF01609411
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DOI: https://doi.org/10.1007/BF01609411