On Galois representations arising from towers of coverings of P1\{0, 1, ∞}

On Galois representations arising from towers of coverings of P1\{0, 1, ∞}
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关于由 P1{0, 1, ∞} 的覆盖塔产生的伽罗瓦表示

DOI:
10.1007/bf01389262
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发表时间:
1986
影响因子:
3.1
通讯作者:
Y. Ihara
Y. Ihara
中科院分区:
数学1区
文献类型:
--
作者:
Y. Ihara

文献摘要

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本文提出了一种新的方法来描述P1\{0,1,∞}的每一个“几乎pro-l”标塔覆盖的-adic Galois表示。这推广了我们的Jacobi和的通用幂级数(参见。[I])它是由n(n→∞)次Fermat曲线的塔所引起的,并包含了2 mln(m:固定,n→∞)次模曲线的塔的情形作为另一个重要的特例.作为一个基本工具,我们将建立和使用福克斯自由微分学中的Blanchfield定理和Lyndon定理的“几乎pro-l版本”。
SummaryWe propose a new way to describe, universally, thel-adic Galois representations associated to each “almost pro-l” tower of etale coverings ofP1\{0, 1, ∞}. This generalizes our universal power series for Jacobi sums (cf. [I]) which arises from the tower of Fermat curves of degreeln (n→∞), and contains the case of the tower of modular curves of level 2mln (m: fixed,n→∞) as another important special case. As a fundamental tool, we shall establish and use an “almost pro-l version” of the theorems of Blanchfield and of Lyndon in Fox free differential calculus.