Simultaneously Non-convergent Frequencies of Words in Different Expansions

Details Simultaneously Non-convergent Frequencies of Words in Different Expansions Simultaneously Non-convergent Frequencies of Words in Different Expansions

2009-04-28

arxiv.org/abs/0904.4370v1

Mathematics

Dynamical Systems

17 pages

Scientific paper

We consider expanding maps such that the unit interval can be represented as a full symbolic shift space with bounded distortion. There are already theorems about the Hausdorff dimension for sets defined by the set of accumulation points for the frequencies of words in one symbolic space at a time. It is shown in this text that the dimension is preserved when sets defined using different maps are intersected. More precisely, it is proven that the dimension of any countable intersection of sets defined by their sets of accumulation for frequencies of words in different expansions, has dimension equal to the infimum of the dimensions of the sets that are intersected. As a consequence, the set of numbers for which the frequencies do not exist has full dimension even after countable intersections. We prove these results also for a dense set of $\beta$-shifts.

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