Institut de Mathématiques de Bordeaux, Université Bordeaux 1, 351, cours de la Libération, F-33405 Talence Cedex, France, FR Département de Mathématiques, Université de Metz, Ile du Saulcy, F-57045 Metz Cedex, France, FR
Abstract:
For a given number field K and any prime lell we construct an increasing sequence of lell -extensions Kn of K which are locally cyclotomic over K. We give various criterious of finiteness or non-finiteness of this lell -tower and we characterise the number fields which have such a finite tower in terms of Iwasawa theory.