Now showing items 2-4 of 4

• KAM theory and a partial justification of Greene's criterion for non-twist maps ﻿

(1999)
Article
Open Access
We consider perturbations of integrable area preserving non twist maps of the annulus those are maps in which the twist condition changes sign These maps appear in a variety of applications notably transport in atmospheric ...
• Lindstedt series for lower dimensional tori ﻿

(1995)
Article
Open Access
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 ﻿

(1995)
Article
Open Access
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 ...