Abstract
It is argued that the prevailing definition of quasicrystals, requiring them to contain an axis of symmetry that is forbidden in periodic crystals, is inadequate. This definition is too restrictive in that it excludes an important and interesting collection of structures that exhibit all the well-known properties of quasicrystals without possessing any forbidden symmetries.
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Lifshitz, R. Quasicrystals: A Matter of Definition. Foundations of Physics 33, 1703–1711 (2003). https://doi.org/10.1023/A:1026247120031
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DOI: https://doi.org/10.1023/A:1026247120031