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Quasi-periodic solutions for the two-dimensional systems with an elliptic-type degenerate equilibrium point under small perturbations

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The second author is supported by the Education Department Project of Hunan Province (No.18C0026) and the NNSF of China (No.11971163)
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  • In this paper, we consider the existence of quasi-periodic solutions for the two-dimensional systems with an elliptic-type degenerate equilibrium point under small perturbations. We prove that under appropriate hypotheses there exist quasi-periodic solutions for perturbed ODEs near the equilibrium point for most parameter values.

    Mathematics Subject Classification: Primary: 34J40, 34C27; Secondary: 34E20.


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