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Counting Cubic Extensions with given Quadratic Resolvent

Henri Cohen 1, 2 Anna Morra 1, 2
2 LFANT - Lithe and fast algorithmic number theory
IMB - Institut de Mathématiques de Bordeaux, Inria Bordeaux - Sud-Ouest
Abstract : Given a number field $k$ and a quadratic extension $K_2$, we give an explicit asymptotic formula for the number of isomorphism classes of cubic extensions of $k$ whose Galois closure contains $K_2$ as quadratic subextension, ordered by the norm of their relative discriminant ideal. The main tool is Kummer theory. We also study in detail the error term of the asymptotics and show that it is $O(X^{\alpha})$, for an explicit $\alpha<1$.
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Submitted on : Friday, March 12, 2010 - 3:43:07 PM
Last modification on : Thursday, January 20, 2022 - 5:31:38 PM

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Henri Cohen, Anna Morra. Counting Cubic Extensions with given Quadratic Resolvent. Journal of Algebra, Elsevier, 2011, 325, pp.461-478. ⟨10.1016/j.jalgebra.2010.08.027⟩. ⟨hal-00463533⟩



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