Fuglede's conjecture is false in 5 and higher dimensions

Details Fuglede's conjecture is false in 5 and higher dimensions Fuglede's conjecture is false in 5 and higher dimensions

2003-06-08

arxiv.org/abs/math/0306134v2

Mathematics

Combinatorics

8 pages, no figures, 2 matrices; submitted, Math Research Letters

Scientific paper

We give an example of a set $\Omega \subset \R^5$ which is a finite union of unit cubes, such that $L^2(\Omega)$ admits an orthonormal basis of exponentials $\{\frac{1}{|\Omega|^{1/2}} e^{2\pi i \xi_j \cdot x}: \xi_j \in \Lambda \}$ for some discrete set $\Lambda \subset \R^5$, but which does not tile $\R^5$ by translations. This answers a conjecture of Fuglede in the negative, at least in 5 and higher dimensions.

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