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arXiv 1803.04064math.NT
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二面角扩张的类数公式

Class number formula for dihedral extensions

Luca Caputo, Filippo A. E. Nuccio

摘要:

给出了$2q$次数域的二面扩张的一个类数公式的代数证明,其中$q$是任意奇数.我们的公式表示的类数的比率为单位的上同调群的顺序的比率,并恢复类似的公式,在文献中出现的特殊情况。作为我们的主要结果的推论,我们得到明确的界限上的(许多)可能的值,可以出现在二面角扩张的类数的比例。这样的界限是通过算术平均得到的,而不需要求助于深层的整表示理论。

英文摘要:

We give an algebraic proof of a class number formula for dihedral extensions of number fields of degree $2q$, where $q$ is any odd integer. Our formula expresses the ratio of class numbers as a ratio of orders of cohomology groups of units and recovers similar formulas which have appeared in the literature as special cases. As a corollary of our main result we obtain explicit bounds on the (finitely many) possible values which can occur as ratio of class numbers in dihedral extensions. Such bounds are obtained by arithmetic means, without resorting to deep integral representation theory.

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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