Displaying similar documents to “A procedure to calcute torsion of elliptic curves over Q.”

On families of 9-congruent elliptic curves

Tom Fisher (2015)

Acta Arithmetica

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We compute equations for the families of elliptic curves 9-congruent to a given elliptic curve. We use these to find infinitely many non-trivial pairs of 9-congruent elliptic curves over ℚ, i.e. pairs of non-isogenous elliptic curves over ℚ whose 9-torsion subgroups are isomorphic as Galois modules.