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Coupling of the GB set property for ergodic averages
Authors:Michel Weber
Institution:(1) Institut de Recherche Mathématique Avancée, Université Louis Pasteur et CNRS, 7, rue René Descartes, 67084 Strasbourg Cedex, France
Abstract:Let (Y,bernou,mgr,T) be an ergodic dynamical system. LetA be an nonempty subset ofL 2(mgr) such that 
$$I(A) = \int_0^{diam(A)} {\sqrt {\log N(A,u)} du< \infty } $$
, whereA=sup{||sȒt||2mgr ,s, tisinA} andN(A, u) is the smallest number ofL 2(mgr)-open balls of radiusu, centered inA, enough to coverA. Let 
$$C(A) = \left\{ {\tfrac{1}{n}\Sigma _{i - 0}^{n - 1} f \circ T^i ,n \geqslant 1,f \in A} \right\}$$
. We prove as a consequence of a more general result, thatC(A) is aGB subset ofL 2(mgr).
Keywords:Ergodic dynamical system  coupling  Gaussian processes  GB sets
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