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Propagation de la 2-birationalité

Claire BourbonJean-François Jaulent — 2013

Acta Arithmetica

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-extension K’/K is linearly disjoint from the cyclotomic ℤ₂-extension K c / K , we prove that K’/K is at most quadratic. Furthermore, we construct infinite towers of such 2-extensions.

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