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The notation follows Mazur and Ullom, Galois module structure of units in real biquadratic number fields, Acta Arithmetica 111.2 (2004) [10.4064/aa111-2-1, MR:2039416] . There are four basic types, I-IV, which describe the structure of the units $U$ modulo roots of unity. The subtype describes the actual structure of the units. Type I (i) means that there is a generating set for $U/\{\pm 1\}$ consisting of fundamental units of the quadratic subfields.

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  • Last edited by David Roberts on 2019-05-03 17:22:09
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