English

Kodaira-Neron statistics for rational elliptic curves with $j$-invariant 0 and 1728

Number Theory 2026-05-15 v1

Abstract

Elliptic curves over \Q\Q with jj-invariant 0 or 1728 have additive reduction at all primes of bad reduction. In addition, all elliptic curves with jj-invariant 0 have bad reduction at p=3p=3 and all elliptic curves with jj-invariant 1728 have bad reduction at p=2p=2. In this paper we count elliptic curves with jj-invariant 0 and 1728 by height and determine asymptotics for the various Kodaira-N\'eron types at 3 and 2, respectively. We also give related statistics by holding the torsion subgoup and isogeny-torsion graph constant.

Keywords

Cite

@article{arxiv.2605.14226,
  title  = {Kodaira-Neron statistics for rational elliptic curves with $j$-invariant 0 and 1728},
  author = {John Cullinan and Sebastian Sargenti},
  journal= {arXiv preprint arXiv:2605.14226},
  year   = {2026}
}

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14 pages