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  • Exponentially small estimates for KAM theorem near an elliptic equilibrium point 

    Delshams Valdés, Amadeu; Gutiérrez Serrés, Pere (1997)
    Article
    Open Access
    We give a precise statement of KAM theorem for a Hamiltonian system in a neighborhood of an elliptic equilibrium point. If the frequencies of the elliptic point satisfy a Diophantine condition, with exponent $\tau$, and ...
  • Teoria Kam Sin Coordenadas Accion-Angulo 

    González, Alejandra; Jorba, Angel; Llave Canosa, Rafael de la; Villanueva Castelltort, Jordi (2001)
    Article
    Open Access
    The classical KAM methods, strongly supported on the use of canonical trans- formations in the action-angle context, are not effcient to be applied to a wide range of systems in which the Hamiltonian is known (for instance) ...