• Lindstedt series for lower dimensional tori 

      Jorba, Angel; Llave Canosa, Rafael de la; Zou, Maorong (1995)
      Article
      Accés obert
      We consider the existence and effective computation of low-dimensional (less independent frequencies than degrees of freedom) invariant tori of a near-integrable system. Lindstedt method is a systematic procedure to compute ...
    • On quasiperiodic perturbations of elliptic equilibrium points 

      Jorba, Angel; Simó Torres, Carlos (1995)
      Article
      Accés obert
      This work focusses on quasiperiodic time-dependent perturbations of ordinary differential equations near elliptic equilibrium points. This means studying $$ \dot{x}=(A+\varepsilon Q(t,\varepsilon))x+\varepsilon ...