Ideal class group

Japanese: イデアル類群 - いであるるいぐん
Ideal class group

...These classes, by multiplication of ideals, form finite abelian groups, called ideal class groups.
[singular]
For an element α of O , if α -1 is also included in O, then α is said to be a unit of K.

*Some of the terminology explanations that mention the "ideal class group" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…またこれらの類は,イデアルの積により,有限アーベル群をなす。これをイデアル類群という。
[単数]
 Oの元αに対し,α-1Oに含まれるときαはKの単数であるという。…

※「イデアル類群」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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