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| | Frieze group - Wikipedia, the free encyclopedia |
 | | In the case of symmetry groups in the plane, additional parameters are the direction of the translation vector, and, for the frieze groups 2, 3, 5, 6, and 7, the positioning perpendicular to the translation vector. |
 | | Formally, a frieze group is a class of infinite discrete symmetry groups for patterns on a strip (infinitely wide rectangle), hence a class of groups of isometries of the plane, or of a strip. |
 | | With the same translation distance, sequences of increasing symmetry are 137, 147, 157, and 126; with halving of the translation distance we also have 23 and 67. |
| en.wikipedia.org /wiki/Frieze_group (1058 words) |
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