网站首页  英汉词典

请输入您要查询的英文单词:

 

单词 Totally real field
释义

Totally real field

中文百科

全实域 Totally real number field

(重定向自Totally real field)

在代数数论中,若数域 K 的每个嵌入 \sigma: K \to \mathbb{C} 的像都落在实数域 \mathbb{R},则称 K全实域全实数域

K 可表为 K=\mathbb{Q}(\alpha),设 \alpha\mathbb{Q} 上的的极小多项式为 P(X),则嵌入映射 \sigma: K \to \mathbb{C} 透过 \sigma \mapsto \sigma(\alpha) 一一对应于 P(X)\mathbb{C} 里的根。K 是全实域若且唯若 P(X) 仅有实根。

另一种判准是:K 是全实域若且唯若 K \otimes_\mathbb{Q} \mathbb{R} \simeq \mathbb{R}^{[K:\mathbb{Q}]}

全实域在代数数论中是较容易处理的数域。对于任意的阿贝尔扩张 L/\mathbb{Q},或者 L 是全实域,或者存在极大的全实子域 K/\mathbb{Q} 使得 [L:K]=2

英语百科

Totally real number field 全实域

(重定向自Totally real field)
The number field Q(√2) sits inside R, and the two embeddings of the field into C send every element in the field to another element of R, hence the field is totally real.

In number theory, a number field K is called totally real if for each embedding of K into the complex numbers the image lies inside the real numbers. Equivalent conditions are that K is generated over Q by one root of an integer polynomial P, all of the roots of P being real; or that the tensor product algebra of K with the real field, over Q, is a product of copies of R.

随便看

 

英汉网英语在线翻译词典收录了3779314条英语词汇在线翻译词条,基本涵盖了全部常用英语词汇的中英文双语翻译及用法,是英语学习的有利工具。

 

Copyright © 2004-2024 encnc.com All Rights Reserved
更新时间:2025/6/21 6:21:46