Isomorphic subgroups

Billiet, Y.; Bertaut, E. F.

doi:10.1107/97809553602060000528

International
Tables for
Crystallography
Volume A
Space-group symmetry
Edited by Th. Hahn

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International Tables for Crystallography (2006). Vol. A. ch. 13.1, pp. 836-842
https://doi.org/10.1107/97809553602060000528

Chapter 13.1. Isomorphic subgroups

Y. Billiet^a ^‡ and E. F. Bertaut^b ^§

^a Département de Chimie, Faculté des Sciences et Techniques, Université de Bretagne Occidentale, Brest, France, and ^bLaboratoire de Cristallographie, CNRS, Grenoble, France

Footnotes

^‡ Present address: 8 place de Jonquilles, F-29860 Bourg-Blanc, France.

^§ Deceased.

¹ In general, this does not hold for non-isomorphic subgroups.
² If the positive directions of c and c′ are opposite, $[{\bi W}' = {\bi W}^{-1}]$ , but this does not bring in any new features.
³ More exactly `congruence modulo $[\specialfonts\bbsf{Z}]$ conditions'.

International Tables for Crystallography (2006). Vol. A. ch. 13.1, pp. 836-842
https://doi.org/10.1107/97809553602060000528