On the index of circular units in the full group of units of a compositum of quadratic fields |
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Authors: | Zdeněk Polický |
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Institution: | Department of Mathematics, Faculty of Science, Masaryk University, Janá?kovo nám. 2a, 602 00 Brno, Czech Republic |
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Abstract: | For a compositum of quadratic fields , where d1,…,ds are square-free odd integers and , we study the group C of circular units of k. We construct a basis of C, compute the index of C in the full group of units of k and derive a lower bound for the divisibility of this index by a power of 2. These results give a lower bound for the divisibility of the class number of the maximal real subfield of k by a power of 2. |
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Keywords: | primary 11R29 secondary 11R27 |
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