Kodaira-Neron statistics for rational elliptic curves with $j$-invariant 0 and 1728
Number Theory
2026-05-15 v1
Abstract
Elliptic curves over with -invariant 0 or 1728 have additive reduction at all primes of bad reduction. In addition, all elliptic curves with -invariant 0 have bad reduction at and all elliptic curves with -invariant 1728 have bad reduction at . In this paper we count elliptic curves with -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