Many problems of stability in the theory of dynamical systems face the difficulty of small divisors. The most famous example is probably given by Kolmogorov-Arnold-Moser theory in the context of Hamiltonian systems, with many applications to physics and astronomy. Other natural small divisor problems arise considering circle diffeomorphisms or quasiperiodic Schroedinger operators. In this volume Hakan Eliasson, Sergei Kuksin and Jean-Christophe Yoccoz illustrate the most recent developments of this theory both in finite and infinite dimension. A list of open problems (including some problems contributed by John Mather and Michel Herman) has been included.
We prove that the solutions of a cohomological equation of complex dimension one and in the analytic category have a monogenic dependence on the parameter. This cohomological equation is the standard linearized conjugacy equation for germs of holomorphic maps in a neighborhood of a fixed point.
Eugenio principe di Savoia-Carignano, conte di Soissons. Generale a soli 24 anni, feldmaresciallo a 27, Eugenio è stato il più grande comandante della storia dell’esercito di Casa d’Austria e dalle cancellerie europee, per l’abilità dimostrata anche in diplomazia, fu considerato ‘l’imperatore segreto’. Dopo il rifiuto da parte di Luigi XIV al suo ingresso nell’esercito, il principe fuggì in Austria e in quel paese iniziò la sua sfolgorante carriera, culminata con l’ascesa ai vertici della macchina militare asburgica, condotta nella duplice veste di combattente e instancabile riformatore. In questa serie di tre volumi viene analizzata la storia, la direzione dell’esercito e la sua organizzazione, compreso l’equipaggiamento e le uniformi della fanteria imperiale al tempo del grande capitano italiano.
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