By Steven Kalikow

ISBN-10: 0521194407

ISBN-13: 9780521194402

This casual creation makes a speciality of the department of ergodic conception referred to as isomorphism idea. workouts, open difficulties, and valuable tricks actively interact the reader and inspire them to take part in constructing proofs independently. excellent for graduate classes, this ebook can also be a beneficial reference for the pro mathematician.

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Conclude35 that if ω ∈ S then 1 M M−1 i=0 f (T i ω) > b+a 2 . This shows that, for more than half the points ω in the base of the tower, M−1 b+a i i=0 f (T ω) > 2 . But it’s just as easy to show that for more than M−1 half the points ω in the base of the tower, i=0 f (T i ω) < b+a 2 . This is a contradiction. 207. Comment. g. 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.

Where B is the σ -algebra of sets that are T -invariant mod 0. Sketch of proof. 246. Exercise. In general, for f ∈ L 2 (( , A, μ)) let P f = lim N →∞ N 1 i n=1 f (T ω). Show that P is the orthogonal projection onto the closure N I of the space of T -invariant functions. Hint: show first that P f is always • T -invariant. Then show that g ∈ I ⊥ implies Pg ∈ I ⊥ . Invoking Theorem 242 now finishes the proof. 10. Conditional expectation of a measure Earlier we showed how to decompose a system into ergodic components.

In this book we will primarily deal with invertible measurepreserving systems. Accordingly, we may not always say “invertible” though we generally mean it unless we specify otherwise. 130. Definition. e. ω ∈ . Then we call π a homomorphism. We also say that the system ( , A , μ , T ) is a factor of the system ( , A, μ, T ), and that the system ( , A, μ, T ) is an extension of the system ( , A , μ , T ). 131. Definition. Let ( , A, μ, T ) and ( , A , μ , T ) be measure-preserving is a homomorphism.

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