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arXiv 1102.3031math.NT
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整体单位模椭圆单位与2-理想类群

Global Units Modulo Elliptic Units and 2-Ideal Class Groups

Stéphane Viguié

摘要:

设p为\in \{2,3\},k为虚二次域,其中p分解为两个不同的素数\mathfrak{p}和\bar{\mathfrak{p}} .设k_ \infty是k在\mathfrak{p}外唯一的Z_p-扩张,K_ \infty是k_ \infty的有限扩张,k是k上的阿贝尔群.证明了在K_ \infty中,p-类群的投射极限与模椭圆单位的单位的投射极限具有相同的μ-不变量和λ-不变量.然后证明了p-类群的投射极限的特征理想与单位模椭圆单位的投射极限的特征理想在一个常数下是一致的.

英文摘要:

Let p\in\{2,3\}, and let k be an imaginary quadratic field in which p decomposes into two distinct primes \mathfrak{p} and \bar{\mathfrak{p}}. Let k_\infty be the unique Z_p-extension of k which is unramified outside of \mathfrak{p}, and let K_\infty be a finite extension of k_\infty, abelian over k. We prove that in K_\infty, the projective limit of the p-class group and the projective limit of units modulo elliptic units share the same μ-invariant and the same λ-invariant. Then we prove that up to a constant, the characteristic ideal of the projective limit of the p-class group coincides with the characteristic ideal of the projective limit of units modulo elliptic units.

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