Unification and classification of two‐dimensional crystalline patterns using orbifolds

The concept of an orbifold is particularly suited to classification and enumeration of crystalline groups in the euclidean (flat) plane and its elliptic and hyperbolic counterparts. Using Conway's orbifold naming scheme, this article explicates conventional point, frieze and plane groups, and d...

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Bibliographic Details
Published in:Acta crystallographica. Section A, Foundations and advances Foundations and advances, 2014-07, Vol.70 (4), p.319-337
Main Authors: Hyde, S. T., Ramsden, S. J., Robins, V.
Format: Article
Language:English
Subjects:
Classification
Crystal structure
crystallographic hyperbolic groups
Crystallography
Euclidean geometry
Euclidean space
Mathematical analysis
Naming
orbifolds
Planes
Three dimensional
Topology
two‐dimensional crystallography
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Summary:The concept of an orbifold is particularly suited to classification and enumeration of crystalline groups in the euclidean (flat) plane and its elliptic and hyperbolic counterparts. Using Conway's orbifold naming scheme, this article explicates conventional point, frieze and plane groups, and describes the advantages of the orbifold approach, which relies on simple rules for calculating the orbifold topology. The article proposes a simple taxonomy of orbifolds into seven classes, distinguished by their underlying topological connectedness, boundedness and orientability. Simpler `crystallographic hyperbolic groups' are listed, namely groups that result from hyperbolic sponge‐like sections through three‐dimensional euclidean space related to all known genus‐three triply periodic minimal surfaces (i.e. the P, D, Gyroid, CLP and H surfaces) as well as the genus‐four I‐WP surface.
ISSN:2053-2733
0108-7673
2053-2733
DOI:10.1107/S205327331400549X