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JOURNALS // Journal of the Belarusian State University. Mathematics and Informatics // Archive

Journal of the Belarusian State University. Mathematics and Informatics, 2017 Volume 3, Pages 11–18 (Mi bgumi140)

Real, Complex and Functional analysis

Calculation of hausdorff dimensions of basins of ergodic measures in encoding spaces

P. N. Varabei

Belarusian State University, 4 Niezaliežnasci Аvenue, Minsk 220030, Belarus

Abstract: In the article we consider spaces $X^{\mathbb{N}}$ of sequences of elements of finite alphabet $X$ (encoding spaces) and ergodic measures on them, basins of ergodic measures and Hausdorff dimensions of such basins with respect to ultrametrics defined by a product of coefficients of unit interval $\theta(x), x\in X$. We call a basin of ergodic measure a set of points of the encoding space which define empiric measures by means of shift map, which limit (in a weak topology generated by continuous functions) is the ergodic measure. The methods of Billingsley and Young are used, which connects Hausdorff dimension and a pointwise dimension of some measure on the space, as well as Shannon – McMillan – Breiman theorem to obtain a lower bound of the dimension of a basin, and a partial analogue of McMillan theorem to obtain the upper bound. The goal of the article is to obtain a formula which can help us to calculate the Hausdorff dimension via entropy of the ergodic measure and a coefficient defined by the ultrametrics.

Keywords: Hausdorff dimension; basin of an ergodic measure; entropy.

UDC: 515.127.13



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