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On the asymptotic behavior of Sudler products along subsequences (2103.14307v1)

Published 26 Mar 2021 in math.NT

Abstract: Let $\alpha \in (0,1)$ and irrational. We investigate the asymptotic behaviour of sequences of certain trigonometric products (Sudler products) $(P_N(\alpha)){N\in\mathbb{N}}$ with $$P_N(\alpha) =\prod{r=1}N|2\sin(\pi r \alpha)|.$$ More precisely, we are interested in the asymptotic behaviour of subsequences of the form $(P_{q_n(\alpha)}(\alpha))_{n\in\mathbb{N}}$, where $q_n(\alpha)$ is the $n$th best approximation denominator of $\alpha$. Interesting upper and lower bounds for the growth of these subsequences are given, and convergence results, obtained by Mestel and Verschueren (see arXiv:1411.2252math[DS]) and Grepstad and Neum\"uller (see arXiv:1801.09416[math.NT]), are generalized to the case of irrationals with bounded continued fraction coefficients.

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