2005/09/01 | 单位根[Root of Unity]
类别(∑〖数学〗) | 评论(0) | 阅读(36) | 发表于 21:05
The th roots of unity are roots of the cyclotomic equation


which are known as the de Moivre numbers. The notations , , and are variously used to denote the th th root of unity.

is always an th root of unity, but -1 is such a root only if is even. In general, the roots of unity form a regular polygon with sides, and each vertex lies on the unit circle.

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