Counting cubic extensions with given quadratic resolvent

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• 作者：Henri Cohen ; Anna Morra
• 关键词：Discriminant counting ; Cubic extensions ; Kummer theory
• 刊名：Journal of Algebra
• 出版年：2011
• 出版时间：1 January 2011
• 年：2011
• 卷：325
• 期：1
• 页码：461-478
• 全文大小：257 K

文摘

Given a number field k and a quadratic extension K₂, we give an explicit asymptotic formula for the number of isomorphism classes of cubic extensions of k whose Galois closure contains K₂ 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^α), for an explicit α<1.