INTERMEDIATE β-SHIFTS AS GREEDY β-SHIFTS WITH A HOLE

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Authors

External Organisational units

  • School of Metallurgy & Materials, University of Birmingham

Abstract

We show that every intermediate \mbox{$\beta$-transformation} is topologically conjugate to a greedy \mbox{$\beta$-transformation} with a hole at zero, and provide a counterexample illustrating that the correspondence is not \mbox{one-to-one}. This characterisation is employed to (1) build a Krieger embedding theorem for intermediate \mbox{$\beta$-transformation}, complementing the result of Li, Sahlsten, Samuel and Steiner [2019], and (2) obtain new metric and topological results on survivor sets of intermediate \mbox{$\beta$-transformations} with a hole at zero, extending the work of Kalle, Kong, Langeveld and Li [2020]. Further, we derive a method to calculate the Hausdorff dimension of such survivor sets as well as results on certain bifurcation sets. Moreover, by taking unions of survivor sets of intermediate \mbox{$\beta$-transformations} one obtains an important class of sets arising in metric number theory, namely sets of badly approximable numbers in non-integer bases. We prove, under the assumption that the underlying symbolic space is of finite type, that these sets of badly approximable numbers are winning in the sense of Schmidt games, and hence have the countable intersection property, extending the results of Hu and Yu [2014], Tseng [2009] and F\"{a}rm, Persson and Schmeling [2010].

Details

Original languageEnglish
Pages (from-to)269-301
Number of pages33
JournalActa mathematica Hungarica
Volume170.2023
Issue number1
DOIs
Publication statusPublished - 25 May 2023