Abstract
We present new results in the local theory of Delone sets, regular systems, and isogonal tilings. In particular, we prove a local criterion for isogonal tilings of the Euclidean space. This criterion is then applied to the study of \(2R\)-isometric Delone sets, where \(R\) is the covering radius for these sets. For regular systems in the plane we establish the exact value \(\widehat{\rho}_2=4R\) of the regularity radius. We prove that in any cell of the Delone tiling in an arbitrary Delone set in the plane, there is a vertex at which the local group is crystallographic. Hence, the subset of points with local crystallographic groups in a Delone set in the plane is itself a Delone set with covering radius at most \(2R\).
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Notes
Initially, we proved the impossibility of isogonal tilings for each subcase separately. The general proof given here was proposed by K. O. Besov.
Another way is to consider the \(m\)- and \((m+2)\)-stars centered at the point \(x\in X\) for sufficiently large \(m\in{\mathbb N}\). Then all the further arguments remain valid with \(N=3m(m+1)+1\).
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Acknowledgments
We are grateful to Konstantin Besov for a useful suggestion that allowed us to shorten the proof of Theorem 5.1. We are also grateful to the referees, whose comments helped to improve the manuscript, as well as to Aleksei Malkov for his help in preparing the figures.
Funding
The work of the first author (Section 2 and Subsections 1–3 and 5 in Section 5) was supported by the Russian Science Foundation under grant no. 20-11-19998, https://rscf.ru/project/20-11-19998/.
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Translated from Trudy Matematicheskogo Instituta imeni V.A. Steklova, 2022, Vol. 318, pp. 73–98 https://doi.org/10.4213/tm4275.
Translated by I. Nikitin
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Dolbilin, N.P., Shtogrin, M.I. Delone Sets and Tilings: Local Approach. Proc. Steklov Inst. Math. 318, 65–89 (2022). https://doi.org/10.1134/S0081543822040071
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DOI: https://doi.org/10.1134/S0081543822040071