… Important examples of algebraic number fields include quadratic fields and cyclotomic fields. In general, a field obtained by adding a primitive m- th root of 1 to Q is called a cyclotomic field. When m is a prime number p , X p -1 + X p -2 + ... + X +1 is an irreducible polynomial, so [ Q (ζ p -1 ): Q ] = p -1. … *Some of the terminology that refers to "cyclotomic field" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… 代数体の重要な例として,二次体,円分体がある。一般に1の原始m乗根,をQに添加して得られる体を円分体cyclotomic fieldという。mが素数pのとき, Xp-1+Xp-2+……+X+1は既約な多項式だから[Q(ζp-1):Q]=p-1である。… ※「cyclotomic field」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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