For a prime number l, we consider l-extensions k(S) of number fields k unramified outside a finite set S subset of S-l of places of k, and we study the Z(l)-rank of the abelian part of k(S)/k and the number of relations of the Galois group G(S) := Gal(k(S)/k). (C) 2002 Elsevier Science (USA).
机构:
Univ Calif Los Angeles, Dept Math, 520 Portola Plaza, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Math, 520 Portola Plaza, Los Angeles, CA 90095 USA