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Espaces différentiables singuliers et corps de nombres algébriques

Patrick Iglesias, Gilles Lachaud (1990)

Annales de l'institut Fourier

On étudie quelques propriétés différentiables de l’espace 𝕋 H , quotient du tore 𝕋 n par un hyperplan irrationnel H . On montre d’une part que le groupe des composantes connexes de Diff ( 𝕋 H ) est isomorphe au groupe des unités de l’algèbre des matrices à coefficients entiers qui stabilisent H , et d’autre part que ce groupe est isomorphe au groupe des unités d’un ordre d’un corps de nombres algébriques.

Extensions cycliques de degré de corps de nombres -réguliers

Florence Soriano (1994)

Journal de théorie des nombres de Bordeaux

We determine all cyclic extensions L of prime degree over a -regular number field K containing the -roots of unity which are also l -regular. We classify these extensions according to the ramification index of the wild place in L / K and to the -valuation of the relative class number h L / K (which is the quotient h L / h K of the ordinary class numbers of L and K ). We study the case where the is odd prime, since the even case was studien by R. Berger. Our genus theory methods rely essentially on G. Gras...

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