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The spectral eigenmatrix problems of planar self-affine measures with four digits

Part of: Nontrigonometric harmonic analysis Classical measure theory Normed linear spaces and Banach spaces; Banach lattices

Published online by Cambridge University Press:  22 August 2023

Jing-Cheng Liu Open the ORCID record for Jing-Cheng Liu [Opens in a new window] ,
Min-Wei Tang Open the ORCID record for Min-Wei Tang [Opens in a new window]  and
Sha Wu Open the ORCID record for Sha Wu [Opens in a new window]
Jing-Cheng Liu
Affiliation:
Key Laboratory of Computing and Stochastic Mathematics (Ministry of Education), School of Mathematics and Statistics, Hunan Normal University, Changsha, Hunan, P.R. China (jcliu@hunnu.edu.cn; tmw33@163.com)
Min-Wei Tang
Affiliation:
Key Laboratory of Computing and Stochastic Mathematics (Ministry of Education), School of Mathematics and Statistics, Hunan Normal University, Changsha, Hunan, P.R. China (jcliu@hunnu.edu.cn; tmw33@163.com)
Sha Wu
Affiliation:
School of Mathematics, Hunan University, Changsha, Hunan, P.R. China (shaw0821@163.com)
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Abstract

Given a Borel probability measure µ on $\mathbb{R}^n$ and a real matrix $R\in M_n(\mathbb{R})$. We call R a spectral eigenmatrix of the measure µ if there exists a countable set $\Lambda\subset \mathbb{R}^n$ such that the sets $E_\Lambda=\big\{{\rm e}^{2\pi i \langle\lambda,x\rangle}:\lambda\in \Lambda\big\}$ and $E_{R\Lambda}=\big\{{\rm e}^{2\pi i \langle R\lambda,x\rangle}:\lambda\in \Lambda\big\}$ are both orthonormal bases for the Hilbert space $L^2(\mu)$. In this paper, we study the structure of spectral eigenmatrix of the planar self-affine measure $\mu_{M,D}$ generated by an expanding integer matrix $M\in M_2(2\mathbb{Z})$ and the four-elements digit set $D = \{(0,0)^t,(1,0)^t,(0,1)^t,(-1,-1)^t\}$. Some sufficient and/or necessary conditions for R to be a spectral eigenmatrix of $\mu_{M,D}$ are given.

Keywords

self-affine measurespectral measurespectrumspectral eigenmatrix

MSC classification

Primary: 28A25: Integration with respect to measures and other set functions 28A80: Fractals
Secondary: 42C05: Orthogonal functions and polynomials, general theory 46C05: Hilbert and pre-Hilbert spaces
Type
Research Article
Information
Proceedings of the Edinburgh Mathematical Society , Volume 66 , Issue 3 , August 2023 , pp. 897 - 918
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Copyright
© The Author(s), 2023. Published by Cambridge University Press on Behalf of The Edinburgh Mathematical Society.

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