By Edoardo Sernesi

The contributions making up this quantity are accelerated types of the classes given on the C.I.M.E. summer time tuition at the conception of Moduli.

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Hence we may assume that A is given in real Jordan form. Then the assertions of the theorem can r- 1 JIRT, 1. Autonomous Linear Differential and Difference Equations 22 be derived from the solution formulas in the generalized eigenspaces. 5) I:" (~)µm-I-iNixo .!. log n n n i=O . i One estimates I:" (~) log i=O µm-I-i Nixo i :::; logm + mf-Xlog (:) + mf-Xlog (lµlm-I-i llNixoll), where the maxima are taken over i one can further estimate (n) = 0, 1, ... , m-1. _ 1og . _ 1og n(n-1) .... (n-i+l) 1 n n i :::; i.

In this case, the vector field f is called complete. Two specific types of orbits will play an important role in this book, namely fixed points and periodic orbits. 1. 5. A fixed point (or equilibrium) of a dynamical system is a point x EX with the property (t, x) = x for all t ER A solution (t, x), t E IR, of a dynamical system is called periodic if there exists S > 0 such that (S + s, x) = (s, x) for all s E R The infimum T of the numbers S with this property is called the period of the solution and the solution is called T-periodic.

In particular, this holds if f is given by a matrix A E Gl(d,R). 3. 3. Linear Dynamical Systems in Discrete Time 39 of A. 1 only form, n ~ 0. If A is invertible, the map

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