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Jarque–Villadelprat conjecture on isochronous centers of real polynomial Hamiltonian systems
Let $n$ be the degree parameter of the real polynomial Hamiltonian system … has no isochronous centers. At present, this conjecture remains open; recent developments are reported b…
Conjectureopendynamical-systems isochronous-centers polynomial-hamiltonian-systemsarXiv posted 2 days ago

Jarque–Villadelprat conjecture on isochronous centers of real polynomial Hamiltonian systems