On the Iwasawa lambda invariant of an imaginary abelian field of conductor 3p^{n+1}

On the Iwasawa lambda invariant of an imaginary abelian field of conductor 3p^{n+1}
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关于导体 3p^{n 1} 的虚阿贝尔场的 Iwasawa lambda 不变量

DOI:
10.1016/j.jnt.2012.08.022
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发表时间:
2013
影响因子:
0.7
通讯作者:
Hiroki Sumida-Takahashi
Hiroki Sumida-Takahashi
中科院分区:
数学3区
文献类型:
--
作者:
Humio Ichimura;Shoichi Nakajima;Hiroki Sumida-Takahashi

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设p为奇素数,p≠3,且K=Q(cos(2π/p),ze3)。令 Kn 为 K 上分圆 Zp 扩展的第 n 层,且 λn 为 Kn 上分圆 Z3 扩展的 Iwasawa lambda 不变量。根据弗里德曼定理,已知 λ 对于足够大的 n 是稳定的。我们借助计算机证明了当p⩽599时,对于所有n⩾1,我们有λn=λ0。此外,对于这些p,我们计算不变式λ0。
Let p be an odd prime number with p≠3, and K=Q(cos(2π/p),ζ3). Let Knbe the n-th layer of the cyclotomic Zp-extension over K, and λnthe Iwasawa lambda invariant of the cyclotomic Z3-extension over Kn. By a theorem of Friedman, it is known that λnis stable for sufficiently large n. We prove that when p⩽599, we have λn=λ0for all n⩾1 with the help of computer. Further, for these p, we calculate the invariant λ0.