TranslationsCrystGroup( G )
determines a basis of the translation lattice of G, binds it to
G.translations, and returns it. Note that this translation lattice is
always invariant under the point group P of G. If
is not yet present, a finite presentation of P needs to be determined.
A basis of the translation lattice can also be added by the user, with
AddTranslationsCrystGroup (see AddTranslationsCrystGroup).
Warning: The component
G.translations must never be set by hand.
have important (and wanted) side effects.
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