Abstract
We find an upper bound for the number of limit cycles, bifurcating from the eight-loop of the Duffing oscillator \(x''= x-x^{3}\) under the special cubic perturbation
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Part of this paper was written while the second author was visiting the Mathematics Institute of Toulouse.
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Gavrilov, L., Gargouri, A. & Hamed, B.B. Special Cubic Perturbations of the Duffing Oscillator \(x''=x-x^3\) Near the Eight-Loop. Mediterr. J. Math. 18, 229 (2021). https://doi.org/10.1007/s00009-021-01868-5
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DOI: https://doi.org/10.1007/s00009-021-01868-5