A class of non-convex polytopes that admit no orthonormal basis of exponentials

```@article{Kolountzakis2001ACO,
title={A class of non-convex polytopes that admit no orthonormal basis of exponentials},
author={Mihail N. Kolountzakis and Michael Papadimitrakis},
journal={Illinois Journal of Mathematics},
year={2001},
volume={46},
pages={1227-1232}
}```
• Published 26 January 2001
• Mathematics
• Illinois Journal of Mathematics
A conjecture of Fuglede states that a bounded measurable set ⊂ R d , of measure 1, can tile R d by translations if and only if the Hilbert space L 2 () has an orthonormal basis consisting of exponentials e�(x) = exp 2πih λ, xi . If has the latter property it is called spectral. Let be a polytope in R d with the following property: there is a direction ξ ∈ S d 1 such that, of all the polytope faces perpendicular to ξ, the total area of the faces pointing in the positive ξ direction is more than… Expand
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A conjecture of Fuglede states that a bounded measurable set \$\Omega\$ in space, of measure 1, can tile space by translations if and only if the Hilbert space \$L^2(\Omega)\$ has an orthonormal basisExpand
Commuting self-adjoint partial differential operators and a group theoretic problem
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