Maximal unramified 3-extensions of imaginary quadratic fields and SL_2(Z_3)

Details Maximal unramified 3-extensions of imaginary quadratic fields and SL_2(Z_3) Maximal unramified 3-extensions of imaginary quadratic fields and SL_2(Z_3)

2006-02-16

arxiv.org/abs/math/0602364v1

J. Number Theory 124 (2007), no. 1, 159--166

Mathematics

Number Theory

7 pages. No figures. LaTeX

Scientific paper

10.1016/j.jnt.2006.08.008

The structure of the Galois group of the maximal unramified p-extension of an imaginary quadratic field is restricted in various ways. In this paper we construct a family of finite 3-groups satisfying these restrictions. We prove several results about this family and characterize them as finite extensions of certain quotients of a Sylow pro-3 subgroup of SL_2(Z_3). We verify that the first group in the family does indeed arise as such a Galois group and provide a small amount of evidence that this may hold for the other members. If this were the case then it would imply that there is no upper bound on the possible lengths of a finite p-class tower.

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