Article Outline
Glossary
Definition of the Subject
Basic Results
Panorama of Examples
Mixing Notions and multiple recurrence
Topological Group Aut(X, μ)
Orbit Theory
Smooth Nonsingular Transformations
Spectral Theory for Nonsingular Systems
Entropy and Other Invariants
Nonsingular Joinings and Factors
Applications. Connections with Other Fields
Concluding Remarks
Bibliography
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Notes
- 1.
This abbreviates ‘infinite tensor product of factors of type I’ (came from the theory of von Neumann algebras).
Abbreviations
- Nonsingular dynamical system:
-
Let \({(X, \mathcal{B}, \mu)}\) be a standard Borel space equipped with a σ‑finite measure. A Borel map \({T \colon X \to X}\) is a nonsingular transformation of X if for any \({N \in \mathcal{B}}\), \({\mu(T^{-1} N) = 0}\) if and only if \({\mu(N) = 0}\). In this case the measure μ is called quasi‐invariant for T; and the quadruple \({(X, \mathcal{B}, \mu, T)}\) is called a nonsingular dynamical system. If \({\mu(A) = \mu(T^{-1}A)}\) for all \({A \in \mathcal{B}}\) then μ is said to be invariant under T or, equivalently, T is measure‐preserving.
- Conservativeness:
-
T is conservative if for all sets A of positive measure there exists an integer \({n \mathchar"313E 0}\) such that \({\mu(A \cap T^{-n} A) \mathchar"313E 0}\).
- Ergodicity:
-
T is ergodic if every measurable subset A of X that is invariant under T (i. e., \({T^{-1}A = A}\)) is either μ-null or μ‑conull. Equivalently, every Borel function \({f \colon X \to \mathbb{R}}\) such that \({f \circ T = f}\) is constant a. e.
- Types II, \({\mathrm{II}_1}\), \({\mathrm{II}_\infty}\) and III:
-
Suppose that μ is non‐atomic and T ergodic (and hence conservative). If there exists a σ‑finite measure ν on \({\mathcal{B}}\) which is equivalent to μ and invariant under T then T is said to be of type II. It is easy to see that ν is unique up to scaling. If ν is finite then T is of type II 1. If ν is infinite then T is of type \({\mathrm{II}_\infty}\). If T is not of type II then T is said to be of type III.
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Danilenko, A.I., Silva, C.E. (2012). Ergodic Theory : Non-singular Transformations . In: Meyers, R. (eds) Mathematics of Complexity and Dynamical Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-1806-1_22
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