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Isotopy classes for 3‐periodic net embeddings
Author(s) -
Power Stephen C.,
Baburin Igor A.,
Proserpio Davide M.
Publication year - 2020
Publication title -
acta crystallographica section a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.742
H-Index - 83
ISSN - 2053-2733
DOI - 10.1107/s2053273320000625
Subject(s) - isotopy , quotient , combinatorics , mathematics , vertex (graph theory) , degeneracy (biology) , torus , graph , discrete mathematics , geometry , biology , bioinformatics
Entangled embedded periodic nets and crystal frameworks are defined, along with their dimension type, homogeneity type, adjacency depth and periodic isotopy type. Periodic isotopy classifications are obtained for various families of embedded nets with small quotient graphs. The 25 periodic isotopy classes of depth‐1 embedded nets with a single‐vertex quotient graph are enumerated. Additionally, a classification is given of embeddings of n ‐fold copies of pcu with all connected components in a parallel orientation and n vertices in a repeat unit, as well as demonstrations of their maximal symmetry periodic isotopes. The methodology of linear graph knots on the flat 3‐torus [0,1) 3 is introduced. These graph knots, with linear edges, are spatial embeddings of the labelled quotient graphs of an embedded net which are associated with its periodicity bases.