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Displaying 1581 – 1600 of 16591

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Analytic torsions on contact manifolds

Michel Rumin, Neil Seshadri (2012)

Annales de l’institut Fourier

We propose a definition for analytic torsion of the contact complex on contact manifolds. We show it coincides with Ray–Singer torsion on any 3 -dimensional CR Seifert manifold equipped with a unitary representation. In this particular case we compute it and relate it to dynamical properties of the Reeb flow. In fact the whole spectral torsion function we consider may be interpreted on CR Seifert manifolds as a purely dynamical function through Selberg-like trace formulae, that hold also in variable...

Anneaux de Fatou

Benali Benzaghou (1968/1969)

Séminaire Delange-Pisot-Poitou. Théorie des nombres

Anneaux d’entiers stablement libres sur [ H 8 × C 2 ]

Jean Cougnard (1998)

Journal de théorie des nombres de Bordeaux

Le groupe H 8 × C 2 est le plus petit groupe pour lequel existent des modules stablement libres non libres. On montre que toutes les classes d’isomorphisme de tels modules peuvent être représentées une infinité de fois par des anneaux d’entiers. On applique un travail de classification de Swan, pour cela on doit construire explicitement des bases normales d’entiers d’extensions à groupe H 8 ; cela se fait en liant un critère de Martinet avec une construction de Witt.

Annihilators of minus class groups of imaginary abelian fields

Cornelius Greither, Radan Kučera (2007)

Annales de l’institut Fourier

For certain imaginary abelian fields we find annihilators of the minus part of the class group outside the Stickelberger ideal. Depending on the exact situation, we use different techniques to do this. Our theoretical results are complemented by numerical calculations concerning borderline cases.

Annihilators of the class group of a compositum of quadratic fields

Jan Herman (2013)

Archivum Mathematicum

This paper is devoted to a construction of new annihilators of the ideal class group of a tamely ramified compositum of quadratic fields. These annihilators are produced by a modified Rubin’s machinery. The aim of this modification is to give a stronger annihilation statement for this specific type of fields.

Annulation du groupe des -classes généralisées d’une extension abélienne réelle de degré premier à

Georges Gras (1979)

Annales de l'institut Fourier

Soit un nombre premier impair. Soit K une extension abélienne réelle de Q de degré premier à et soit G son groupe de Galois; soit φ ( φ 1 ) un caractère -adique irréductible de K . Soit M la -extension abélienne maximale de K non ramifiée en dehors de et soit 𝒜 le Z [ G ] -module Gal ( M / K ) ; 𝒜 φ (la φ -composante de 𝒜 ) est un module fini sur l’anneau des entiers Z ψ ' de Q ψ ' (corps des valeurs sur Q d’un caractère ψ ' de degré 1 divisant φ ). On construit explicitement pour tout n 0 un élément 𝒮 n de Z ψ ' qui annule le module...

Another 80-dimensional extremal lattice

Mark Watkins (2012)

Journal de Théorie des Nombres de Bordeaux

We show that the unimodular lattice associated to the rank 20 quaternionic matrix group SL 2 ( F 41 ) S ˜ 3 GL 80 ( Z ) is a fourth example of an 80-dimensional extremal lattice. Our method is to use the positivity of the Θ -series in conjunction with an enumeration of all the norm 10 vectors. The use of Aschbacher’s theorem on subgroups of finite classical groups (reliant on the classification of finite simple groups) provides one proof that this lattice is distinct from the previous three, while computing the inner product...

Currently displaying 1581 – 1600 of 16591