Lemniscate

Japanese: lemniscate
Lemniscate

...This is the curve described by point P, whose product of distances from two points A( a ,0) and B( -a ,0) is equal to b2 . The Cassini curve when b = a , that is, the curve represented by ( x2 + y2 ) 2 = 2a2 ( x2 - y2 ), is usually called a lemniscate or rhomboid. This is the orthogonal curve of the right - angled hyperbola x2 - y2 = 2a2 at the origin O (Figure 12). ...

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

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…これは2点A(a,0),B(-a,0)からの距離の積がb2に等しいような点Pの描く曲線である。baの場合のカッシーニ曲線,すなわち(x2y2)2=2a2(x2y2)の表す曲線をふつうレムニスケートlemniscateまたは連珠形という。これは直角双曲線x2y2=2a2の原点Oに関する垂足曲線である(図12)。…

※「lemniscate」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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