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A generalization of a result on integers in metacyclic extensions

James Carter (1999)

Colloquium Mathematicae

Let p be an odd prime and let c be an integer such that c>1 and c divides p-1. Let G be a metacyclic group of order pc and let k be a field such that pc is prime to the characteristic of k. Assume that k contains a primitive pcth root of unity. We first characterize the normal extensions L/k with Galois group isomorphic to G when p and c satisfy a certain condition. Then we apply our characterization to the case in which k is an algebraic number field with ring of integers ℴ, and, assuming some...

A propos de la relation galoisienne x 1 = x 2 + x 3

Franck Lalande (2010)

Journal de Théorie des Nombres de Bordeaux

L’existence d’un polynôme f , irréductible sur un corps k de caractéristique 0 et dont trois racines vérifient la relation linéaire x 1 = x 2 + x 3 , ne dépend que de la paire de groupes finis ( G , H ) où G = Gal k ( f ) et H ⊂ G est le fixateur d’une racine. Le cas régulier ( H = 1 ) est désormais assez bien décrit. On démontre dans ce texte que pour de nombreuses paires ( G , H ) primitives ( H sous-groupe maximal de G ) et en particulier pour toutes celles de degré ≤ 50 , la relation x 1 = x 2 + x 3 n’est pas réalisable.En appendice, Joseph Oesterlé démontre que cette...

An analogue of Pfister's local-global principle in the burnside ring

Martin Epkenhans (1999)

Journal de théorie des nombres de Bordeaux

Let N / K be a Galois extension with Galois group 𝒢 . We study the set 𝒯 ( 𝒢 ) of ℤ -linear combinations of characters in the Burnside ring ℬ ( 𝒢 ) which give rise to ℤ -linear combinations of trace forms of subextensions of N / K which are trivial in the Witt ring W ( K ) of K . In particular, we prove that the torsion subgroup of ℬ ( 𝒢 ) / 𝒯 ( 𝒢 ) coincides with the kernel of the total signature homomorphism.

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