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In order to properly describe the general positions of Space Groups, symmetry operators are also given in *Seitz notation*. Using this notation, symmetry operations are indicated in the following way:

where 'R' is a symbol denoting the rotational character of the symmetry operation, i.e. if it is a rotation or rotoinversion (if the 'R' symbol is primed the symmetry operation contains time-reversal), and '

'R' symbol consists of a number indicating the order of the rotation, with a preceeding '-' for rotoinversions (except for planes that are denoted by the letter 'm') and a subscript that gives the direction where the axis of this rotation or rotoinversion lies.

Some examples to 'R' symbols that may appear in the Seitz notation are:

{1|0,0,0} | |

{1'|0,1/2,1/2} | |

{2x|1/2,1/2,0} | |

{m_{-yz}'|3/4,1/4,3/4} | |

{-3^{-}_{xy-z}'|0,1/2,1/2} | |

{4x|0,0,0} | |

{-6_{z}|0,0,1/2} |

References:

1. D. B. Litvin and V. Kopský, Seitz notation for symmetry operations of space groups, Acta Cryst. A

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