English

Big fields that are not large

Number Theory 2020-08-11 v3

Abstract

A subfield KK of Qˉ\bar{\mathbb{Q}} is largelarge if every smooth curve CC over KK with a rational point has infinitely many rational points. A subfield KK of Qˉ\bar{\mathbb{Q}} is bigbig if for every positive integer nn, KK contains a number field FF with [F:Q][F:\mathbb{Q}] divisible by nn. The question of whether all big fields are large seems to have circulated for some time, although we have been unable to find its origin. In this paper we show that there are big fields that are not large.

Keywords

Cite

@article{arxiv.2004.08989,
  title  = {Big fields that are not large},
  author = {Barry Mazur and Karl Rubin},
  journal= {arXiv preprint arXiv:2004.08989},
  year   = {2020}
}

Comments

minor corrections. To appear in Proceedings of the AMS

R2 v1 2026-06-23T14:57:15.737Z