Average Cyclicity for Elliptic Curves in Torsion Families
Abstract
We prove asymptotic formulas for cyclicity of reductions of elliptic curves over the rationals in a family of curves having specified torsion. These results agree with established conditional results and with average results taken over larger families. As a key tool, we prove an analogue of a result of Vladut that estimates the number of elliptic curves over a finite field with a specified torsion point and cyclic group structure.
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