Prefer a chat interface with context about you and your work?
Rational torsion in elliptic curves and the cuspidal subgroup
Let A be an elliptic curve over ℚ of square free conductor N that has a rational torsion point of prime order r such that r does not divide 6N. We show that then r divides the order of the cuspidal subgroup C of J 0 (N). If A is …