Construction of response solutions for two classes of quasi-periodically forced four-dimensional nonlinear systems with degenerate equilibrium point under small perturbations
Construction of response solutions for two classes of quasi-periodically forced four-dimensional nonlinear systems with degenerate equilibrium point under small perturbations
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Keywords
Quasi-periodic response solutions, The Pöschel–Rüssmann KAM method, Degenerate equilibrium point, The Brjuno–Rüssmann's non-resonant condition, Herman method
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