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Real quadratic number fields with metacyclic Hilbert 2 -class field tower

Said Essahel, Ahmed Dakkak, Ali Mouhib (2019)

Mathematica Bohemica

We begin by giving a criterion for a number field K with 2-class group of rank 2 to have a metacyclic Hilbert 2-class field tower, and then we will determine all real quadratic number fields ( d ) that have a metacyclic nonabelian Hilbert 2 -class field tower.

Relations entre les 2-groupes de classes d’idéaux des extensions quadratiques k ( d ) et k ( - d )

Bernard Oriat (1977)

Annales de l'institut Fourier

Damey et Payan ont montré que la différence des 4-rangs des groupes des classes d’idéaux des corps quadratiques Q ( a ) et Q ( - a ) est majorée par ( a étant positif) : 0 dim 4 H Q ( - a ) - dim 4 H Q ( a ) 1 . Dans ce papier, l’auteur généralise cette propriété en remplaçant le corps de base Q par un corps de nombres k quelconque. La méthode employée est issue du “Spiegelungssatz” de Leopoldt.

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