Discriminante dos corpos abelianos

AUTOR(ES)
DATA DE PUBLICAÇÃO

2003

RESUMO

The computation of the discriminant of a number field K has represented a great challenge to number theorists, and certainly the difficulty lies in determining an integral basis for K. "When K is Abelian, one can resort to the Kronecker- Weber theorem, which guarantees that K is contained in some cyclotomic field Q( (m). ln this case, one can use the conductor-discriminant formula for evaluating the discriminant of K. The results obtained here aim at efficiently computing the discriminant of any Abelian number field. For that, we wiIl fully use the conductor-discriminant formula, which states that the discriminant of a field K is the product of the conductors of the characters associated to K. "When the conductor of K is a power of an odd prime p, that is, K ç Q((pr) for some positive integer r, then the discriminant of K is a function of its degree only - see the formula given in Theorem 3.1. When p = 2, Theorem 3.3 provides a formula for the discriminant of K which consists of two expressions, depending on whether K is a cyclotomic field. The general case is addressed in Theorem 3.4. lt gives the discriminant of any Abelian number field as a function of its degree, its conductor, and the degrees of some particular subfields of K

ASSUNTO(S)

caracteres de grupos corpos algebricos teoria dos numeros algebricos

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