On imaginary quadratic number fields with 2-class group of rank 4 and infinite 2-class field tower

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On Imaginary Quadratic Number Fields with 2-class Group of Rank 4 and Infinite 2-class Field Tower

Let k be an imaginary quadratic number field with Ck,2, the 2-Sylow subgroup of its ideal class group Ck, of rank 4. We show that k has infinite 2-class field tower for particular families of fields k, according to the 4-rank of Ck, the Kronecker symbols of the primes dividing the discriminant ∆k of k, and the number of negative prime discriminants dividing ∆k. In particular we show that if the...

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On 2-class field towers of imaginary quadratic number fields

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Let k = k be a quadratic number field with discriminant ∆. For n ≥ 0, we define fields k inductively by taking k as the compositum of all unramified quadratic extensions of k that are central over k. Then k(∞) = ⋃∞ n=0 k (n,2) is the 2-class field tower of k. In the following, we call k the n central 2-step. The structure of the Galois group Gal (k/k) of the first central 2-step is determined b...

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ژورنال

عنوان ژورنال: Pacific Journal of Mathematics

سال: 2001

ISSN: 0030-8730

DOI: 10.2140/pjm.2001.201.257