Normal Integral Bases and Embedding Problems.
We present a detailed analysis of some properties of a general tamely ramified Kummer extension of number fields L/K. Our main achievement is a criterion for the existence of a normal integral basis for a general Kummer extension, which generalizes the existing results. Our approach also allows us to explicitly describe the Steinitz class of L/K and we get an easy criterion for this class to be trivial. In the second part of the paper we restrict to the particular case of tame Kummer extensions...
Explicit normal integral bases are given for some cyclic quintic fields defined by Emma Lehmer’s parametric family of quintics.
Assuming the Generalized Riemann Hypothesis (GRH), we show that the norm-Euclidean Galois cubic fields are exactly those with discriminantA large part of the proof is in establishing the following more general result: Let be a Galois number field of odd prime degree and conductor . Assume the GRH for . Ifthen is not norm-Euclidean.
On démontre, à partir de résultats de H.J. Godwin, H. Brunotte et F. Halter-Koch, le théorème suivant : soit un corps cubique cyclique de conducteur dont le groupe de Galois est engendré par ; soit le groupe des unités de norme 1.Soit , , telle que soit minimum. Alors est un -générateur de .