González Robert–et al. twisted lim sup conjecture

Let ω=(ωn)n1{\bm \omega}=({\bm \omega}_{n})_{n\ge 1} be a sequence of points in Rd\mathbb{R}^{d}, and let r=(r1,,rd){\bf r}=(r_1,\ldots,r_d) be a dd-tuple of non-increasing functions. For the twisted lim sup set

T(ω,r):={β[0,1)d:ωnβ+Rn(r)(mod1) for infinitely many nN},\mathcal{T}({\bm \omega},{\bf r}):=\left\{ {\bm \beta}\in[0,1)^{d}: {\bm \omega}_{n}\in {\bm \beta}+\mathcal{R}_{n}({\bf r})\pmod 1\text{ for infinitely many }n\in\mathbb{N}\right\},

González Robert–et al. conjecture. For almost every sequence ω{\bm \omega} in Rd\mathbb{R}^{d}, for every dd-tuple of non-increasing functions r=(r1,,rd){\bf r}=(r_1,\ldots,r_d),

Ld(T(ω,r))={0,if n=1i=1dri(n)<,1,if n=1i=1dri(n)=.\mathcal{L}^{d}\big(\mathcal{T}({\bm \omega},{\bf r})\big)=\begin{cases}0,&\text{if }\sum_{n=1}^{\infty}\prod_{i=1}^{d}r_i(n)<\infty,\\1,&\text{if }\sum_{n=1}^{\infty}\prod_{i=1}^{d}r_i(n)=\infty. \end{cases}

This conjecture predicts a zero–one law for twisted lim sup sets generated by almost every sequence. The supplied text attributes it to González Robert et al. and does not provide evidence of resolution.

Sources & referencesView supporting material

Primary source

Sam Chow and Qing-Long Zhou, “Twisted Diophantine approximation for matrix transformations of tori”, arXiv:2511.14954 (2025).

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