The iwasawa invariant μ in the composite of two Zl-extensions

The iwasawa invariant μ in the composite of two Zl-extensions
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两个 Zl 扩展复合中的 iwasawa 不变量 μ

DOI:
10.1016/0022-314x(81)90009-3
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发表时间:
1981
影响因子:
0.7
通讯作者:
F. Gerth
F. Gerth
中科院分区:
数学3区
文献类型:
--
作者:
John R Bloom;F. Gerth

文献摘要

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设k 0是有理数的有限扩张域,并假设k 0至少有两个Zl-扩张。设至少有一个Zl-扩张Kk 0具有岩泽不变量μ= 0,设L是Kk 0的Zl-扩张和Kk 0的另一个Zl-扩张的合成.本文给出了μ非零时k 0的Zl-扩张个数的一个上界.
Let k 0 be a finite extension field of the rational numbers, and assume k 0 has at least two Z l-extensions. Assume that at least one Z l-extension K k 0 has Iwasawa invariant μ= 0, and let L be the composite of K and some other Z l-extension of k 0. In this paper we find an upper bound for the number of Z l-extensions of k 0 contained in L with nonzero μ.