Fundamental periodic parallelogram - Fundamental periodic parallelogram

Japanese: 基本周期平行四辺形 - きほんしゅうきへいこうしへんけい
Fundamental periodic parallelogram - Fundamental periodic parallelogram

…That is, if ω 1 and ω 2 are complex numbers different from 0 and satisfy Im(ω 12 )>0, then a function f that is rational in C and satisfies f ( z +2 m ω 1 +2 n ω 2 )= f ( z ) for any zC and any integers m and n is called an elliptic function with fundamental periods 2ω 1 and 2ω 2 (the use of 2ω 1 and 2ω 2 instead of ω 1 and ω 2 has various advantages and is conventional). A parallelogram with four vertices 0, 2ω 1 , 2ω 2 , and 2ω 1 + 2ω 2 is called a fundamental period parallelogram. Historically, the study of elliptic functions has its origins in elliptic integrals. …

*Some of the terminology explanations that mention "fundamental periodic parallelogram" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…すなわち,ω1とω2を,0と異なる複素数でIm(ω12)>0を満たすものとしたとき,Cで有理型な関数fで,任意のzCと,任意の整数m,nに対して, f(z+2mω1+2nω2)=f(z)を満たすものを,2ω1と2ω2を基本周期とする楕円関数という(ω12を採らず2ω1,2ω2を用いるのは,種々の利点があり,慣用となっている)。4点0,2ω1,2ω2,2ω1+2ω2を頂点とする平行四辺形を基本周期平行四辺形という。 歴史的には,楕円関数の研究は,楕円積分に源をもつ。…

※「基本周期平行四辺形」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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