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On the Notions of Symmetry and Aperiodicity for Delone Sets

Author(s): Michael Baake | Uwe Grimm

Journal: Symmetry
ISSN 2073-8994

Volume: 4;
Issue: 4;
Start page: 566;
Date: 2012;
Original page

Keywords: Delone sets | tilings | symmetry | aperiodicity

Non-periodic systems have become more important in recent years, both theoretically and practically. Their description via Delone sets requires the extension of many standard concepts of crystallography. Here, we summarise some useful notions of symmetry and aperiodicity, with special focus on the concept of the hull of a Delone set. Our aim is to contribute to a more systematic and consistent use of the different notions.
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