THE EULER-KRONECKER INVARIANTS IN VARIOUS FAMILIES OF GLOBAL FIELDS by
THE EULER-KRONECKER INVARIANTS IN VARIOUS FAMILIES OF GLOBAL FIELDS by
复制标题
全球域各个族中的欧拉-克罗内克不变量
DOI:
--
复制
发表时间:
2006
期刊:
影响因子:
--
通讯作者:
Y. Ihara
中科院分区:
文献类型:
--
作者:
Y. Ihara
— The invariant in the title is, essentially, the constant term in the Laurent expansion at s = 1 of the corresponding Dedekind zeta function. We shall give (i) algebraic treatments of the invariants in the function field case, and (ii) numerical data for various families of number fields, with discussions on some striking phenomena. Résumé (L’invariants d’Euler-Kronecker dans des corps globaux de différentes familles) L’invariant du titre est, essentiellement, le terme constant dans le développement de Laurent en s = 1 de la fonction zêta correspondante de Dedekind. Nous donnerons (i) des traitements algébriques des invariants dans le cas des corps de fonctions, et (ii) des données numériques pour différentes familles de corps de nombres, avec une discussion sur quelques phénomènes intéressants. Introduction Let K be a global field, i.e., either an algebraic number field of finite degree (abbreviated NF), or an algebraic function field of one variable over a finite field (abbreviated FF). Let ζK(s) be the Dedekind zeta function of K. As in our previous article [4], we denote by γK (∈ R) the quotient, the constant term divided by the residue, in the Laurent expansion of ζK(s) at s = 1. In other words, (0.0.1) γK = lim s→1 Å ζ ′ K(s) ζK(s) + 1 s− 1 ã . We consider γK as an invariant of K, and for various families K of global fields, shall study the behaviour of the distribution of values of γK for K ∈ K. As for the main motivation of this study, some basic results, and for connections with other arithmetic problems, see [4]. Here, we only recall that the value of γK becomes “very negative” when K has many primes with small norms (e.g. has many 2000 Mathematics Subject Classification. — Primary 11R42, Secondary 11R47, 11R58.