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arXiv 1808.09007math.NT
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实二次数域上理想格的正则基扭曲

Canonical basis twists of ideal lattices from real quadratic number fields

Mohamed Taoufiq Damir, Lenny Fukshansky

摘要:

由实二次数域生成的平面上的理想格,近年来已被一些作者研究过。特别地,已经证明了每个这样的理想都有一个基,可以通过对角群的作用扭曲成一个良好圆格的Minkowski约化基。我们明确地研究了这种扭曲的理想,这是特别重要的算术理论的二次数域和二进制二次型的典型基础。具体地说,我们证明了每个固定的实二次域在平面上只有200个理想,这些理想的标准基可以扭曲成一个完整的或稳定的格。我们展示了这种扭曲的一些明确的例子。我们还简要地讨论了任意理想基的稳定扭曲和完善扭曲之间的关系。

英文摘要:

Ideal lattices in the plane coming from real quadratic number fields have been investigated by several authors in the recent years. In particular, it has been proved that every such ideal has a basis that can be twisted by the action of the diagonal group into a Minkowski reduced basis for a well-rounded lattice. We explicitly study such twists on the canonical bases of ideals, which are especially important in arithmetic theory of quadratic number fields and binary quadratic forms. Specifically, we prove that every fixed real quadratic field has only finitely many ideals whose canonical basis can be twisted into a well-rounded or a stable lattice in the plane. We demonstrate some explicit examples of such twists. We also briefly discuss the relation between stable and well-rounded twists of arbitrary ideal bases.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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