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par St´ephaneR.LOUBOUTIN OntheuseofexplicitboundsonresiduesofDedekindzetafunctionstakingintoaccountthebehaviorofsmallprimes 17 (2005),559–573 JournaldeTh´eoriedesNombresdeBordeaux

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Journal de Th´ eorie des Nombres de Bordeaux

17

(2005), 559–573

On the use of explicit bounds on residues of Dedekind zeta functions taking into account

the behavior of small primes

par St´ ephane R. LOUBOUTIN

R´esum´e. Nous donnons des majorants explicites des r´esidus au points= 1 des fonctions zˆetaζK(s) des corps de nombres tenant compte du comportement des petits nombres premiers dans K.

Dans le cas o`uK est ab´elien, de telles majorations sont d´eduites de majorations de|L(1, χ)|tenant compte du comportement deχ sur les petits nombres premiers, pourχun caract`ere de Dirichlet primitif. De nombreuses applications sont donn´ees pour illustrer l’utilit´e de tels majorants.

Abstract. Lately, explicit upper bounds on|L(1, χ)| (for prim- itive Dirichlet characters χ) taking into account the behaviors of χ on a given finite set of primes have been obtained. This yields explicit upper bounds on residues of Dedekind zeta func- tions of abelian number fields taking into account the behavior of small primes, and it as been explained how such bounds yield im- provements on lower bounds of relative class numbers of CM-fields whose maximal totally real subfields are abelian. We present here some other applications of such bounds together with new bounds for non-abelian number fields.

St´ephane R.Louboutin

Institut de Math´ematiques de Luminy, UMR 6206 163, avenue de Luminy, Case 907

13288 Marseille Cedex 9, FRANCE E-mail:[email protected]

Manuscrit re¸cu le 5 mars 2004.

Mots clefs. L-functions, Dedekind zeta functions, number fields, class number.

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