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# On small perturbation of four-dimensional quasi-periodic system with degenerate equilibrium point

• This paper focuses on quasi-periodic perturbation of four dimensional nonlinear quasi-periodic system. Using the KAM method, the perturbed system can be reduced to a suitable normal form with zero as equilibrium point by a quasi-periodic transformation. Hence, the perturbed system has a quasi-periodic solution near the equilibrium point.
Mathematics Subject Classification: Primary: 34C20; Secondary: 34D10.

 Citation:

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