2005/07/09 | 二次不变式[Quadratic Invariant]
类别(∑〖数学〗) | 评论(0) | 阅读(26) | 发表于 12:05
Given the binary quadratic form

with polynomial discriminant , let


Then
[center]

where



so

Surprisingly, this is the same discriminant as before, but multiplied by the factor . The quantity is called the quadratic invariant modulus.
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