Two-dimensional space groups with sevenfold symmetry
- 1 January 1986
- journal article
- Published by International Union of Crystallography (IUCr) in Acta Crystallographica Section A Foundations of Crystallography
- Vol. 42 (1) , 55-56
- https://doi.org/10.1107/s0108767386099907
Abstract
Fivefold and sevenfold symmetry operations are, of course, incompatible with repetition by a lattice but, with the appearance of structures involving curved sheets, they and other non-crystallographic operations must now be taken into consideration as possibilities of non-Euclidean crystallography develop. Here are described the symmetry groups which might be called 732 and 73m and which may be found in two-dimensional manifolds.Keywords
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