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Sur la racine carrée de la codifférente

Stéphane Vinatier — 2003

Journal de théorie des nombres de Bordeaux

On présente deux résultats nouveaux concernant la racine carrée de la codifférente d’une extension faiblement ramifiée de . Le premier, relatif à sa structure galoisienne, s’inscrit dans la stratégie classique développée notamment par Fröhlich et Taylor. Le second, qui concerne le réseau entier unimodulaire associé, est prouvé à l’aide de calculs numériques portant sur des exemples intéressants.

Permuting the partitions of a prime

Stéphane Vinatier — 2009

Journal de Théorie des Nombres de Bordeaux

Given an odd prime number p , we characterize the partitions ̲ of p with p parts 0 1 ... p - 1 0 for which there exist permutations σ , τ of the set { 0 , ... , p - 1 } such that p divides i = 0 p - 1 i σ ( i ) but does not divide i = 0 p - 1 i τ ( i ) . This happens if and only if the maximal number of equal parts of ̲ is less than p - 2 . The question appeared when dealing with sums of p -th powers of resolvents, in order to solve a Galois module structure problem.

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