Glide symmetry

Japanese: 映進対称 - えいしんたいしょう
Glide symmetry

...Therefore, there are 11 types of spirals : 21 , 31 , 32, 41 , 42 , 43 , 61 , 62 , 63 , 64 , 65. As shown in Figure 13, among these, 31 and 32 , 41 and 43 , 61 and 65, and 62 and 64 have two in each pair that are clockwise and counterclockwise, and 42 , 62 , and 64 also serve as 2, and 63 also serves as 3.
[Glide symmetry]
A spiral is created by combining a rotation and a translation, but when a rotation and a translation are combined, the same axis of rotation is simply moved to a different position unless n = 2. When n = 2, a new symmetry operation called a glide arises, which is the combination of a reflection and a translation t parallel to the plane (Figure 14).

*Some of the terminology explanations that mention "gliding symmetry" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…したがって,らせんには21,31,32,41,42,43,61,62,63,64,65の11種類があり,図13で示すように,これらの中で31と32,41と43,61と65および62と64とはそれぞれの対の中の二つが右回りと左回りの関係にあり,また42と62と64は2を兼ね,63は3を兼ねている。
[映進対称]
 回転と並進との合成でらせんが生じたが,回反と並進との合成では,n=2以外の場合には,同じ回反軸が異なった位置に移されたものとなるだけである。n=2のときには,鏡映とその面に平行な並進tとの合成である映進とよばれる新しい対称操作が生ずる(図14)。…

※「映進対称」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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