Papers › Minimal models of rational elliptic curves with non-trivial torsion
Minimal models of rational elliptic curves with non-trivial torsion
Alexander J. Barrios
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In this paper, we explicitly classify the minimal discriminants of all elliptic curves E/ℚ with a non-trivial torsion subgroup. This is done by considering various parameterized families of elliptic curves with the property that they parameterize all elliptic curves E/ℚ with a non-trivial torsion point. We follow this by giving admissible change of variables, which give a global minimal model for E. We also provide necessary and sufficient conditions on the parameters of these families to determine the primes at which E has additive reduction. In addition, we use these parameterized families to give new proofs of results due to Frey and Flexor-Oesterl\'{e} pertaining to the primes at which an elliptic curve over a number field K with a non-trivial K-torsion point can have additive reduction.
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