Gutiérrez i Serrés, Pere (Date of defense: 1995-06-02)
La memòria recull contribucions a diversos aspectes del problema de l'estabilitat en sistemes hamiltonians quasi-integrables. Aquests aspectes inclouen resultats d'estabilitat efectiva, que comporten ...
Jorba i Monte, Àngel (Date of defense: 1991-10-11)
In this work we study several topics concerning quasi-periodic time-dependent perturbations of ordinary differential equations. This kind of equations appear as models in many applied problems of Celestial ...