Mathematics – Functional Analysis
Scientific paper
2006-04-25
J. Funct. Anal. 247 (2007), no. 1, 110--137
Mathematics
Functional Analysis
new version, we included the suggestions of the referee
Scientific paper
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 $\br^d$, and the ``IFS'' refers to such a finite system of transformations, or functions. The iteration limits are pairs $(X, \mu)$ where $X$ is a compact subset of $\br^d$, (the support of $\mu$) and the measure $\mu$ 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 $L^2(X,\mu)$; and (2) the interplay between the geometry of $(X, \mu)$ on the one side, and the spectral data entailed by possible Fourier bases.
Dutkay Dorin E.
Jorgensen Palle E. T.
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