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arXiv 0708.0108math.NT
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$\GL_{n}$在特征零点的亚复盖的尺规作图法

Geometric construction of metaplectic covers of $\GL_{n}$ in characteristic zero

Richard Hill

摘要:

本文给出了代数数域k上$\GL_{n}$的m重次复盖的一种新构造,其中k包含本原m次单位根.给出了代表该扩张的$\GL_{n}(\A)$上的2-上循环,并显式地找到了$\GL_{n}(k)$上的上循环的分裂。上循环在k的几乎所有地方都是光滑的。由此,得到了$\SL_{n}$上的久保田符号的公式。本文的结构既不需要类场论,也不需要代数K理论,而是依赖于W. Habicht和T.久保田作为推论,得到了数域的幂互反律。

英文摘要:

This paper presents a new construction of the m-fold metaplectic cover of $\GL_{n}$ over an algebraic number field k, where k contains a primitive m-th root of unity. A 2-cocycle on $\GL_{n}(\A)$ representing this extension is given and the splitting of the cocycle on $\GL_{n}(k)$ is found explicitly. The cocycle is smooth at almost all places of k. As a consequence, a formula for the Kubota symbol on $\SL_{n}$ is obtained. The construction of the paper requires neither class field theory nor algebraic K-theory, but relies instead on naive techniques from the geometry of numbers introduced by W. Habicht and T. Kubota. The power reciprocity law for a number field is obtained as a corollary.

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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