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Fourier frequencies in affine iterated function systems
Journal article   Open access   Peer reviewed

Fourier frequencies in affine iterated function systems

Dorin Ervin Dutkay and Palle E.T Jorgensen
Journal of functional analysis, Vol.247(1), pp.110-137
2007
DOI: 10.1016/j.jfa.2007.03.002
url
https://doi.org/10.1016/j.jfa.2007.03.002View
Published (Version of record) Open Access

Abstract

We examine two questions regarding Fourier frequencies for a class of iterated function systems (IFS). These are iteration limits arising from a fixed finite families of affine and contractive mappings in R d , and the “IFS” refers to such a finite system of transformations, or functions. The iteration limits are pairs ( X , μ ) where X is a compact subset of R d (the support of μ), and the measure μ is a probability measure determined uniquely by the initial IFS mappings, and a certain strong invariance axiom. The two questions we study are: (1) existence of an orthogonal Fourier basis in the Hilbert space L 2 ( X , μ ) ; and (2) explicit constructions of Fourier bases from the given data defining the IFS.
Hilbert space Spectral measure Fourier series Attractor Affine fractal Spectrum

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