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On the torsion of rational elliptic curves over sextic fields

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arxiv 1808.02887 v2 pith:VM6XL36X submitted 2018-08-08 math.NT math.AG

classification math.NTmath.AG
keywords torsionmathbboccurcurvesellipticfieldsgroupssextic
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abstract

Given an elliptic curve $E/\mathbb{Q}$ with torsion subgroup $G = E(\mathbb{Q})_{\rm tors}$ we study what groups (up to isomorphism) can occur as the torsion subgroup of $E$ base-extended to $K$, a degree 6 extension of $\mathbb{Q}$. We also determine which groups $H = E(K)_{\rm tors}$ can occur infinitely often and which ones occur for only finitely many curves. This article is a first step towards a complete classification of torsion growth of over sextic fields.

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  1. Torsion groups of Mordell curves over cubic and sextic fields

    math.NT 2019-08 reject novelty 6.0 of 10

    For Mordell curves over cubic fields the torsion subgroup is one of five cyclic groups; over sextic fields the rational-coefficient list gains five product groups, and arbitrary sextic coefficients add Z/19, Z/7 and Z...

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