An outline of ergodic theory - download pdf or read online

By Steven Kalikow

ISBN-10: 0521194407

ISBN-13: 9780521194402

This casual advent specializes in the department of ergodic thought often called isomorphism conception. workouts, open difficulties, and worthwhile tricks actively interact the reader and inspire them to take part in constructing proofs independently. perfect for graduate classes, this booklet can be a important reference for the pro mathematician.

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14]), systems with continuous time (see Krengel 1985, p. 10, for discussion), as well as for some systems without an invariant measure. Indeed, a (possibly non-measure preserving) system ( , A, μ, T ) is said to be asymptotn μ(T −i A) exists for every ically mean stationary, or AMS, if limn n1 i=1 measurable set A. For a development of the theory of such systems, including a relevant extension of the Birkhoff ergodic theorem, see Gray (1988, Chapters 6–8). 208. Exercise. ) In the ergodic case of N f (T i ω) = f dμ.

Denote this good set of x by G(w, ). 234. Exercise. Show that any x ∈ G = P(x). w,h G(w, h1 ) is generic and satisfies 235. Theorem. ). e. e. f dμ = f dμx dμ(x). First proof of Theorem. 235. We’ll give two proofs of this theorem. This is the first. e. and by Theorem 226 μx is ergodic whenever it is defined. 43 That is, the measure ν constructed in Theorem 226. Notice that it is unique, by Comment 223. 9780521194402c02 48 CUP/KKW October 10, 2009 21:55 Page-48 Measure-preserving systems 236. Exercise.

Exercise. There exists δ > 0 such that, with positive probability, x is not in the union of the translates of C and T x, T 2 x, . . , T M x are all more than δ away from x. 32 Hint: let Fn = {x : |x − T j x| > n1 , 1 ≤ j ≤ • M} and show that μ(Fn ) → 1. Choose an interval I of diameter < δ such that μ(I ∩ E) > 0. Let C = C ∪ (I ∩ E). 177. Exercise. Show that C ∈ S, C C and C ∼ C, a contradiction. 178. Definition. Let ( , A, μ, T ) be an invertible measure-preserving system and suppose S ∈ A with S, T S, T 2 S, .

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