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 Results for DC.creator="M." AND DC.creator="I." AND DC.creator="Aroyo" in section 2.1.2 of volume A1   page 1 of 2 pages.
Structure of the subgroup tables
Wondratschek, H. and Aroyo, M. I.  International Tables for Crystallography (2011). Vol. A1, Section 2.1.2, pp. 72-76 [ doi:10.1107/97809553602060000797 ]
... as introduced in International Tables for X-ray Crystallography, Vol. I (1952). These numbers run from 1 to 17 for ... stated explicitly. The block designations are: (1) In the block I Maximal translationengleiche subgroups, all maximal translationengleiche subgroups are listed, see ... supergroups are split into two main blocks with the headings I Minimal translationengleiche supergroups and II Minimal non-isomorphic klassengleiche ...

Subgroups with two origin choices
Wondratschek, H. and Aroyo, M. I.  International Tables for Crystallography (2011). Vol. A1, Section 2.1.2.5.2, pp. 74-75 [ doi:10.1107/97809553602060000797 ]
... the origin shift. The transformation has been chosen such that (i) it transforms the nonconventional description of the space group to ... 2.1.2.5.4 , No. 50, origin choice 1 and origin choice 2. I Maximal translationengleiche subgroups There are seven maximal t-subgroups of ...

Monoclinic subgroups
Wondratschek, H. and Aroyo, M. I.  International Tables for Crystallography (2011). Vol. A1, Section 2.1.2.5.1, p. 74 [ doi:10.1107/97809553602060000797 ]
... a-glide reflection. Example 2.1.2.5.3 , No. 50; origin choice 1. I Maximal (monoclinic) translationengleiche subgroups : conventional unique axis c; nonconventional glide ...

Special rules for the setting of the subgroups
Wondratschek, H. and Aroyo, M. I.  International Tables for Crystallography (2011). Vol. A1, Section 2.1.2.5, pp. 74-76 [ doi:10.1107/97809553602060000797 ]
... a-glide reflection. Example 2.1.2.5.3 , No. 50; origin choice 1. I Maximal (monoclinic) translationengleiche subgroups : conventional unique axis c; nonconventional glide ... the origin shift. The transformation has been chosen such that (i) it transforms the nonconventional description of the space group to ... 2.1.2.5.4 , No. 50, origin choice 1 and origin choice 2. I Maximal translationengleiche subgroups There are seven maximal t-subgroups ...

Sequence of the subgroup and supergroup data
Wondratschek, H. and Aroyo, M. I.  International Tables for Crystallography (2011). Vol. A1, Section 2.1.2.4, p. 73 [ doi:10.1107/97809553602060000797 ]
... stated explicitly. The block designations are: (1) In the block I Maximal translationengleiche subgroups, all maximal translationengleiche subgroups are listed, see ... supergroups are split into two main blocks with the headings I Minimal translationengleiche supergroups and II Minimal non-isomorphic klassengleiche supergroups. ...

Specification of the setting
Wondratschek, H. and Aroyo, M. I.  International Tables for Crystallography (2011). Vol. A1, Section 2.1.2.3, p. 73 [ doi:10.1107/97809553602060000797 ]
Specification of the setting 2.1.2.3. Specification of the setting All 17 plane-group types1 and 230 space-group types are listed and described in IT A. However, whereas each plane-group type is represented exactly once, 44 space-group types, i.e. nearly 20%, are represented twice. This means that the conventional ...

General position
Wondratschek, H. and Aroyo, M. I.  International Tables for Crystallography (2011). Vol. A1, Section 2.1.2.2.2, pp. 72-73 [ doi:10.1107/97809553602060000797 ]
General position 2.1.2.2.2. General position Like the generators, the general position has also been copied from IT A, where an explanation can be found in Section 2.2.11 . The general position in IT A is the first block under the heading `Positions', characterized by its site symmetry of 1. The elements ...

Generators selected
Wondratschek, H. and Aroyo, M. I.  International Tables for Crystallography (2011). Vol. A1, Section 2.1.2.2.1, p. 72 [ doi:10.1107/97809553602060000797 ]
Generators selected 2.1.2.2.1. Generators selected As in IT A, for each plane group and space group a set of symmetry operations is listed under the heading `Generators selected'. From these group elements, can be generated conveniently. The generators in this volume are the same as those in IT A. They ...

Data from IT A
Wondratschek, H. and Aroyo, M. I.  International Tables for Crystallography (2011). Vol. A1, Section 2.1.2.2, pp. 72-73 [ doi:10.1107/97809553602060000797 ]
Data from IT A 2.1.2.2. Data from IT A 2.1.2.2.1. Generators selected | | As in IT A, for each plane group and space group a set of symmetry operations is listed under the heading `Generators selected'. From these group elements, can be generated conveniently. The generators in this volume are the ...

Headline
Wondratschek, H. and Aroyo, M. I.  International Tables for Crystallography (2011). Vol. A1, Section 2.1.2.1, p. 72 [ doi:10.1107/97809553602060000797 ]
... as introduced in International Tables for X-ray Crystallography, Vol. I (1952). These numbers run from 1 to 17 for ... Tables for X-ray Crystallography (1952, 1965, 1969). Vol. I, Symmetry Groups, edited by N. F. M. Henry & K. Lonsdale. Birmingham: Kynoch Press. International Tables for ...

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