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Inequivalent symmetry
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Inequivalent symmetry : ウィキペディア英語版
Inequivalent symmetry

Two symmetrical patterns are considered to be equivalent if they have exactly the same types of symmetry. As recently as 1891, it was finally proved that there are only 17 inequivalent symmetry patterns in the plane. However, the Moors, who lived in Spain from the eighth to the fifteenth centuries, were aware of all 17 types of symmetry patterns. Examples of the patterns were used to decorate the Alhambra, a Moorish fortress in Granada.
〔Gary L. Musser, William F. Burger, & Blake E. Peterson. Mathematics for Elementary Teachers: A Contemporary Approach. John Wiley & Sons, Inc. p864.〕
==References==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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