Abstract
We prove that, for every \(k\ge 4\), the sets M(k) and L(k), which are Markov and Lagrange dynamical spectra related to conservative horseshoes and associated to continued fractions with coefficients bounded by k coincide with the intersections of the classical Markov and Lagrange spectra with \((-\infty ,\sqrt{k^2+4k}]\). We also observe that, despite the corresponding statement is also true for \(k=2\), it is false for \(k=3\).
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Acknowledgements
The first author is partially supported by CNPq by the project Alagoas Dinâmica - 409198/2021-8, CNPq/MCTI/FNDCT No 18/2021 - Faixa A and by FAPEAL. We also thank the anonymous referee for his valuable suggestions.
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Davi Lima partially supported by CNPq and FAPEAL.
Carlos Gustavo Moreira partially supported by CNPq and Faperj.
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Lima, D., Moreira, C.G. Dynamical characterization of initial segments of the Markov and Lagrange spectra. Monatsh Math 199, 817–852 (2022). https://doi.org/10.1007/s00605-022-01765-3
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DOI: https://doi.org/10.1007/s00605-022-01765-3
Keywords
- Markov dynamical spectrum
- Lagrange dynamical spectrum
- Regular Cantor sets
- Horseshoes
- Diophantine approximation