Tohoku Mathematical Journal

The index of elliptic units in $\boldsymbol{Z}_p$-extensions, II

Hassan Oukhaba

Source: Tohoku Math. J. (2) Volume 61, Number 2 (2009), 253-265.

Abstract

In this paper we continue to explore the index of elliptic units. In a previous article we determined the asymptotic behavior in $\boldsymbol{Z}_p$-extensions of the $p$-part of this index divided by the $p$-part of the ideal class number. We proved the existence of an invariant $\mu_\infty$ which governs this behavior, and gave sufficient conditions for the vanishing of $\mu_\infty$. Here we give examples with nonzero $\mu_\infty$, especially in the case of anticyclotomic $\boldsymbol{Z}_p$-extensions.

Primary Subjects: 11G16
Secondary Subjects: 11R23

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Links and Identifiers

Permanent link to this document: http://projecteuclid.org/euclid.tmj/1245849447
Digital Object Identifier: doi:10.2748/tmj/1245849447
Zentralblatt MATH identifier: 05608374

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