The 2-Sylow subgroup of K2OF for number fields F

The 2-Sylow subgroup of K2OF for number fields F
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数域 F 的 K2OF 的 2-Sylow 子群

DOI:
10.1016/j.jalgebra.2004.10.024
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发表时间:
2005-02
期刊:
影响因子:
0.9
通讯作者:
Hourong Qin
Hourong Qin
中科院分区:
数学3区
文献类型:
--
作者:
Hourong Qin

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设F是二次数域。通过Hilbert符号给出了F的驯服核中的二阶元素是F的驯服核的四次幂的一个判据。所得结果可用于计算F的驯服核的8-秩和虚二次数域的Tate核。本文给出了判别式恰好有两个奇素因子的所有二次数域的K2 OF的8-秩。当F是K ~ 2 OF =0的8秩虚二次数域时,也给出了F的Tate核.讨论了我们的方法在分圆域的最大真实的子域上的应用。数值例子,特别是4秩K2 OF = 8秩K2 OF =2的二次数域F的例子说明了我们的结果.
Let F be a quadratic number field. We give a criterion, via Hilbert symbols, for an element of order two in the tame kernel of F to be a fourth power in the tame kernel of F. The result can be applied to compute the 8-rank of the tame kernel of F and the Tate kernel of an imaginary quadratic number field. We list the 8-ranks of K2OFfor all quadratic number fields whose discriminants have exactly two odd prime divisors. In the case when F is an imaginary quadratic number field with the 8-rank of K2OF=0, the Tate kernel of F is given too. An application of our method to the maximal real subfield of a cyclotomic field is discussed. Numerical examples, in particular the examples of quadratic number fields F with 4-rank of K2OF= 8-rank of K2OF=2 illustrate our results.
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