Swan modules, class fieids, and class groups of cyclic p-groups.
Action of Aut (.../...) on Zeta-Integrals and Local Constants.
Galois module structure of units in real biquadratic number fields
Unit indices and cohomology for biquadratic extensions of imaginary quadratic fields
We investigate as Galois module the unit group of biquadratic extensions of number fields. The -rank of the first cohomology group of units of is computed for general . For imaginary quadratic we determine a large portion of the cases (including all unramified ) where the index takes its maximum value , where are units mod torsion of and are units mod torsion of one of the 3 quadratic subfields of .
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