Iterative approximations of exponential bases on fractal measures

Details Iterative approximations of exponential bases on fractal measures Iterative approximations of exponential bases on fractal measures

2011-09-21

arxiv.org/abs/1109.4669v2

Mathematics

Functional Analysis

Scientific paper

For some fractal measures it is a very difficult problem in general to prove the existence of spectrum (respectively, frame, Riesz and Bessel spectrum). In fact there are examples of extremely sparse sets that are not even Bessel spectra. In this paper we investigate this problem for general fractal measures induced by iterated function systems (IFS). We prove some existence results of spectra associated with Hadamard pairs. We also obtain some characterizations of Bessel spectrum in terms of finite matrices for affine IFS measures, and one sufficient condition of frame spectrum in the case that the affine IFS has no overlap.

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