Assouad Dimensions and Spectra of Graphs of Weierstrass-Type Functions with Rapidly Growing Frequencies
Year: 2026
Type: preprint
Abstract: We study the Assouad dimension, lower dimension, and Assouad spectrum of graphs of the functions \(f(x)=\sum_{n=1}^{\infty}a_nϕ(b_nx+θ_n)\), where \(ϕ\) is a nonconstant \(1\)-periodic \(C^2\) function, \(a_n,b_n>0\), \((θ_n)\) is an arbitrary real sequence, \(\sum_{n=1}^{\infty}a_n<\infty\), and \(b_{n+1}/b_n\to\infty\). We give sufficient conditions for the graph over every nondegenerate compact interval to have Assouad dimension two or lower dimension one. For \(a_n=b_n^{-α}\), \(0<α<1\), an explicit frequency-gap condition ensures that the Assouad spectrum equals two for \(α\leq\vartheta<1\). Writing \(β_*=\limsup_{n\to\infty}\log b_{n+1}/\log b_n\), we show that, if \(β_*>(2-α)/α\), the spectrum attains the general upper bound for \(α\)-Hölder graphs whenever \((2-α)/β_*\leq\vartheta<α\) and \(\vartheta>0\). When \(β_*=\infty\), this determines the complete spectrum. Together with Barański's formulas, our results yield graphs whose lower, Hausdorff, upper box, and Assouad dimensions are four distinct numbers.
Source: arXiv (Cornell University)
Authors: Xiong, Dong-Hong, Luo, Jun Jason
Institution: Chongqing University
Language: English
Subfield: Mathematical Physics
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7214998897