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Inhomogeneous self-similar sets with overlaps
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Baker, Simon, Fraser, Jonathan M. and Máthé, András (2019) Inhomogeneous self-similar sets with overlaps. Ergodic Theory and Dynamical Systems, 39 (1). pp. 1-18. doi:10.1017/etds.2017.13 ISSN 0143-3857.
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Official URL: https://doi.org/10.1017/etds.2017.13
Abstract
It is known that if the underlying iterated function system satisfies the open set condition, then the upper box dimension of an inhomogeneous self-similar set is the maximum of the upper box dimensions of the homogeneous counterpart and the condensation set. First, we prove that this ‘expected formula’ does not hold in general if there are overlaps in the construction. We demonstrate this via two different types of counterexample: the first is a family of overlapping inhomogeneous self-similar sets based upon Bernoulli convolutions; and the second applies in higher dimensions and makes use of a spectral gap property that holds for certain subgroups of SO(d) for d > 3. We also obtain new upper bounds for the upper box dimension of an inhomogeneous self-similar set which hold in general. Moreover, our counterexamples demonstrate that these bounds are optimal. In the final section we show that if the weak separation property is satisfied, ie. the overlaps are controllable, then the ‘expected formula’ does hold.
| Item Type: | Journal Article | ||||||||
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| Subjects: | Q Science > QA Mathematics | ||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Mathematics | ||||||||
| Library of Congress Subject Headings (LCSH): | Set theory | ||||||||
| Journal or Publication Title: | Ergodic Theory and Dynamical Systems | ||||||||
| Publisher: | Cambridge University Press | ||||||||
| ISSN: | 0143-3857 | ||||||||
| Official Date: | January 2019 | ||||||||
| Dates: |
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| Volume: | 39 | ||||||||
| Number: | 1 | ||||||||
| Page Range: | pp. 1-18 | ||||||||
| DOI: | 10.1017/etds.2017.13 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||
| Date of first compliant deposit: | 20 February 2017 | ||||||||
| Date of first compliant Open Access: | 4 December 2017 |
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