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Good elliptic curves with a specified torsion subgroup

23 Dec 2020arXiv:2012.12475links table onlyarchive 2025-07-28

Alexander J. Barrios

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An elliptic curve E over ℚ is said to be good if N_E⁶<max{ |c₄³|,c₆²} where N_E is the conductor of E and c₄ and c₆ are the invariants associated to a global minimal model of E. In this article, we generalize Masser's Theorem on the existence of infinitely many good elliptic curves with full $2$-torsion. Specifically, we prove via constructive methods that for each of the fifteen torsion subgroups T allowed by Mazur's Torsion Theorem, there are infinitely many good elliptic curves E with E(ℚ) ₜₒᵣₛ≅T.

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