Propagation de la 2-birationalité

Details Propagation de la 2-birationalité Propagation de la 2-birationalité

2011-12-14

arxiv.org/abs/1112.3195v1

Mathematics

Number Theory

Scientific paper

Let L/K be a 2-birational CM-extension of a totally real 2-rational number field. We characterize in terms of tame ramification totally real 2-extensions K'/K such that the compositum L'= LK' is still 2-birational. In case the 2-extensions K'/K is linearly disjoint from the cyclotomic Z2-extension Kc/K, we prove that K'/K is at most quadratic. In the other hand we construct infinite towers of such 2-extensions.

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