INTERMEDIATE β-SHIFTS AS GREEDY β-SHIFTS WITH A HOLE
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In: Acta mathematica Hungarica, Vol. 170.2023, No. 1, 25.05.2023, p. 269-301.
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TY - JOUR
T1 - INTERMEDIATE β-SHIFTS AS GREEDY β-SHIFTS WITH A HOLE
AU - Langeveld, Niels
AU - Samuel, Tony
PY - 2023/5/25
Y1 - 2023/5/25
N2 - 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].
AB - 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].
KW - intermediate beta fransformations
KW - alpha winning
KW - embeddings
U2 - 10.1007/s10474-023-01337-3
DO - 10.1007/s10474-023-01337-3
M3 - Article
VL - 170.2023
SP - 269
EP - 301
JO - Acta mathematica Hungarica
JF - Acta mathematica Hungarica
SN - 0236-5294
IS - 1
ER -