Abstract
In this paper we develop a geometric framework for spectral pairs and for orthogonal families of complex exponentials in L 2(μ), where μ is a given Borel probability measure supported in \({\mathbb {R}^{d}}\).
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Bohnstengel, J., Jorgensen, P. Geometry of spectral pairs. Anal.Math.Phys. 1, 69–99 (2011). https://doi.org/10.1007/s13324-011-0005-2
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DOI: https://doi.org/10.1007/s13324-011-0005-2