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Enumerating quartic dihedral extensions of with signatures

Henri Cohen (2003)

Annales de l’institut Fourier

In a previous paper, we have given asymptotic formulas for the number of isomorphism classes of D 4 -extensions with discriminant up to a given bound, both when the signature of the extensions is or is not specified. We have also given very efficient exact formulas for this number when the signature is not specified. The aim of this paper is to give such exact formulas when the signature is specified. The problem is complicated by the fact that the ray class characters which appear are not all genus characters....

Fundamental units for orders of unit rank 1 and generated by a unit

Stéphane R. Louboutin (2016)

Banach Center Publications

Let ε be an algebraic unit for which the rank of the group of units of the order ℤ[ε] is equal to 1. Assume that ε is not a complex root of unity. It is natural to wonder whether ε is a fundamental unit of this order. It turns out that the answer is in general yes, and that a fundamental unit of this order can be explicitly given (as an explicit polynomial in ε) in the rare cases when the answer is no. This paper is a self-contained exposition of the solution to this problem, solution which was...

Fundamental units in a family of cubic fields

Veikko Ennola (2004)

Journal de Théorie des Nombres de Bordeaux

Let 𝒪 be the maximal order of the cubic field generated by a zero ε of x 3 + ( - 1 ) x 2 - x - 1 for , 3 . We prove that ε , ε - 1 is a fundamental pair of units for 𝒪 , if [ 𝒪 : [ ε ] ] / 3 .

Generalized Kummer theory and its applications

Toru Komatsu (2009)

Annales mathématiques Blaise Pascal

In this report we study the arithmetic of Rikuna’s generic polynomial for the cyclic group of order n and obtain a generalized Kummer theory. It is useful under the condition that ζ k and ω k where ζ is a primitive n -th root of unity and ω = ζ + ζ - 1 . In particular, this result with ζ k implies the classical Kummer theory. We also present a method for calculating not only the conductor but also the Artin symbols of the cyclic extension which is defined by the Rikuna polynomial.

Mahler measures in a cubic field

Artūras Dubickas (2006)

Czechoslovak Mathematical Journal

We prove that every cyclic cubic extension E of the field of rational numbers contains algebraic numbers which are Mahler measures but not the Mahler measures of algebraic numbers lying in E . This extends the result of Schinzel who proved the same statement for every real quadratic field E . A corresponding conjecture is made for an arbitrary non-totally complex field E and some numerical examples are given. We also show that every natural power of a Mahler measure is a Mahler measure.

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