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Conjugate elements and conjugate subgroups
Wondratschek, H., International Tables for Crystallography (2011). Vol. A1, Section 1.2.4.3, p. [ doi:10.1107/97809553602060000791 ]
numbers of subgroups, i.e. have different lengths. Equation (1.2.4.1) can be written Using conjugation, Definition 1.2.4.2.3 can be formulated as Definition 1.2.4.3.3.  A subgroup of a group ...

Definition
Wondratschek, H., International Tables for Crystallography (2011). Vol. A1, Section 1.2.4.1, p. [ doi:10.1107/97809553602060000791 ]
introduction to the subgroups of space groups There may be sets of elements that do not constitute the full group but nevertheless fulfil the group postulates for themselves. Definition 1.2.4.1.1.  A subset of elements ...

Subgroups
Wondratschek, H., International Tables for Crystallography (2011). Vol. A1, Section 1.2.4, p. [ doi:10.1107/97809553602060000791 ]
of into the same cosets: Subgroups that fulfil equation (1.2.4.1) are called `normal subgroups' according to the following definition: Definition 1.2.4.2.3.  A subgroup is called a normal sub­group or invariant subgroup ...

Coset decomposition and normal subgroups
Wondratschek, H., International Tables for Crystallography (2011). Vol. A1, Section 1.2.4.2, p. [ doi:10.1107/97809553602060000791 ]
subgroups' according to the following definition: Definition 1.2.4.2.3.  A subgroup is called a normal sub­group or invariant subgroup of,, if equation (1.2.4.1) is fulfilled. The relation always ...

Factor groups and homomorphism
Wondratschek, H., International Tables for Crystallography (2011). Vol. A1, Section 1.2.4.4, p. [ doi:10.1107/97809553602060000791 ]
introduction to the subgroups of space groups For the following definition, the `product of sets of group elements' will be used: Definition 1.2.4.4.1.  Let be a group and, be two arbitrary sets of its elements which ...

Normalizers
Wondratschek, H., International Tables for Crystallography (2011). Vol. A1, Section 1.2.4.5, p. [ doi:10.1107/97809553602060000791 ]
Definition 1.2.4.5.1.  The set of all elements that map the subgroup onto itself by conjugation,, forms a group, called the normalizer of in, where . Remarks (1) The group is a normal ...

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