Steinitz classes of some abelian and nonabelian extensions of even degree

Details Steinitz classes of some abelian and nonabelian extensions of even degree Steinitz classes of some abelian and nonabelian extensions of even degree

2010-01-15

arxiv.org/abs/1001.2721v1

Journal de Th\'eorie des Nombres de Bordeaux, tome 22, num\'ero 3, 2010, pages 607-628

Mathematics

Number Theory

Scientific paper

The Steinitz class of a number field extension K/k is an ideal class in the ring of integers O_k of k, which, together with the degree [K:k] of the extension determines the O_k-module structure of O_K. We call R_t(k,G) the classes which are Steinitz classes of a tamely ramified G-extension of k. We will say that those classes are realizable for the group G; it is conjectured that the set of realizable classes is always a group. In this paper we will develop some of the ideas contained in arXiv:0910.5080 to obtain some results in the case of groups of even order. In particular we show that to study the realizable Steinitz classes for abelian groups, it is enough to consider the case of cyclic groups of 2-power degree.

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