On the Markoff spectrum on the Hecke group of index six

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초록

The discrete part of the Markoff spectrum on the Hecke group of index 6 was determined by A. Schmidt. In this paper, we study its Markoff and Lagrange spectra after the smallest accumulation point 4/3. We show that both the Markoff and Lagrange spectra below 4/3+ϵ have positive Hausdorff dimension for any positive ϵ. We also find maximal gaps and an isolated point in the spectra. © 2026 Royal Dutch Mathematical Society (KWG).

키워드

Hecke groupLagrange spectrumMarkoff spectrum
제목
On the Markoff spectrum on the Hecke group of index six
저자
Cha, ByungchulKim, Dong HanSim, Deokwon
DOI
10.1016/j.indag.2026.01.004
발행일
2026
유형
Article in press
저널명
Indagationes Mathematicae