English

On the exceptional set in the $abc$ conjecture

Number Theory 2025-07-08 v1

Abstract

The abcabc conjecture states that there are only finitely many triples of coprime positive integers (a,b,c)(a,b,c) such that a+b=ca+b=c and rad(abc)<c1ϵ\operatorname{rad}(abc) < c^{1-\epsilon} for any ϵ>0\epsilon > 0. Using the optimized methods in a recent work of Browning, Lichtman and Ter\"av\"ainen, we showed that the number of those triples with cXc \leqslant X is O(X56/85+ε)O\left(X^{56/85+\varepsilon}\right) for any ε>0\varepsilon > 0, where 56850.658824\frac{56}{85} \approx 0.658824. This constitutes an improvement of the previous bound O(X33/50)O\left(X^{33/50}\right).

Keywords

Cite

@article{arxiv.2507.02885,
  title  = {On the exceptional set in the $abc$ conjecture},
  author = {Runbo Li},
  journal= {arXiv preprint arXiv:2507.02885},
  year   = {2025}
}

Comments

15 pages

R2 v1 2026-07-01T03:45:27.457Z