• A pseudo-normal form for planar vector fields 

      Delshams Valdés, Amadeu; Guillamon Grabolosa, Antoni; Lázaro Ochoa, José Tomás (2001)
      Article
      Accés obert
    • Global periodicity conditions for maps and recurrences via Normal Forms 

      Cima Mollet, Anna; Gasull Embid, Armengol; Mañosa Fernández, Víctor (2012-05-04)
      Altres
      Accés obert
      We face the problem of characterizing the periodic cases in parametric families of (real or complex) rational diffeomorphisms having a fixed point. Our approach relies on the Normal Form Theory, to obtain necessary conditions ...
    • Pseudo-normal form near saddle-center or saddle-focus equilibria 

      Delshams Valdés, Amadeu; Lázaro Ochoa, José Tomás (2003)
      Article
      Accés obert
      In this paper we introduce the pseudo-normal form, which generalizes the notion of normal form around an equilibrium. Its convergence is proved for a general analytic system in a neighborhood of a saddle-center or a ...